Warning: This is just a long story about what GAS can do to a person and how in the end, it is all a circle. Feel free to ignore and move along 
My first camera (as in the one I bought with my own money), was a Canon EOS 300. Quickly I graduated to a 30E, always drooling over the 3 and the 1V. Eventually I sold the 30E (kept the 300) and got a Nikon digital system. Went from the D70s to the D2H, to D2X (plus some other digital stuff over the years) and then back to medium format film. At that point, I decided to get a 35mm camera as they were dirt cheap. What better than getting a EOS 3 for nothing, I could even use my first 300 as backup. Eventually I replaced the 3 with a 1V.
At some point I decided to try some Zeiss lenses and what better way than on a Nikon FM2n, as a manual Nikon is something I always wanted to try. I loved that so much I decided to drop the 1V and get a F100 to accompany the FM2n, both as backup but to use the AF lenses too.
Well..that didn't last long...at some point I though I don't need 35mm much, I just shoot medium format anyway (have I been here before?). So sell everything only to realise I do want 35mm as MF can be a drag to carry around. So back to a Canon 3 as I'm thinking I only want 35mm for convenience, right? So that's AF. And if it is AF I'll get a Canon as I still have my first EOS 300 and why not have that as a backup (eeeerm...I really have been here before).
But then somehow I end up with a Summicron-R 50/2 which is great to use on the EOS 3...apart from the stop down metering. And I'm looking at the pictures and I'm thinking...this Leica stuff is great...so there's an R8 arriving a few days later. And obviously what do you need some Canons if you have the R8, so sell the EOS 3 and get a backup R8, so now I have one in black and one in silver. And a few lenses. At this point I should have sought professional help but...
All would be good till the point where the lack of AE lock is just too painful and I'm thinking my eyes are just not up to scratch for manual focus anymore. So back to a EOS 3 (is this my 3rd now?) for a week as there I go walking around and I find a EOS 1N for £49. Fourty.Nine.Pounds. Grab that, sell the 3 and make £50 profit. Did I just have a free 1N? Done.
But not done. The 1N is great...but heavy. And big. Just like the 3 and 1V were. So...here's the solution. An EOS 30. See, if only I stopped buying cameras 15 years ago I would have saved myself a bit of money (admittedly not that much since I hardly ever make a loss worth mentioning when buying/selling gear).
The end. Oh no wait. See, I wanted a macro lens a few months ago. I could just get a macro on Canon mount but there I am looking at an F3HP and a 55/3.5 micro for less than £200. Which is roughly the cost of a reasonable macro lens for the Canon. So now I have the F3HP. And that 50/1.2 kept winking at me so there it is too. And while I'm at it...I really like the shots from the 85/1.4 (had one with the FM2n and F100). So I'm looking for one of those too now. And if I find one...well wouldn't it be great to have a AF body for it, say a F100...
At least the EOS 300 has always been there for me.
DOES IT EVER STOP?

My first camera (as in the one I bought with my own money), was a Canon EOS 300. Quickly I graduated to a 30E, always drooling over the 3 and the 1V. Eventually I sold the 30E (kept the 300) and got a Nikon digital system. Went from the D70s to the D2H, to D2X (plus some other digital stuff over the years) and then back to medium format film. At that point, I decided to get a 35mm camera as they were dirt cheap. What better than getting a EOS 3 for nothing, I could even use my first 300 as backup. Eventually I replaced the 3 with a 1V.
At some point I decided to try some Zeiss lenses and what better way than on a Nikon FM2n, as a manual Nikon is something I always wanted to try. I loved that so much I decided to drop the 1V and get a F100 to accompany the FM2n, both as backup but to use the AF lenses too.
Well..that didn't last long...at some point I though I don't need 35mm much, I just shoot medium format anyway (have I been here before?). So sell everything only to realise I do want 35mm as MF can be a drag to carry around. So back to a Canon 3 as I'm thinking I only want 35mm for convenience, right? So that's AF. And if it is AF I'll get a Canon as I still have my first EOS 300 and why not have that as a backup (eeeerm...I really have been here before).
But then somehow I end up with a Summicron-R 50/2 which is great to use on the EOS 3...apart from the stop down metering. And I'm looking at the pictures and I'm thinking...this Leica stuff is great...so there's an R8 arriving a few days later. And obviously what do you need some Canons if you have the R8, so sell the EOS 3 and get a backup R8, so now I have one in black and one in silver. And a few lenses. At this point I should have sought professional help but...
All would be good till the point where the lack of AE lock is just too painful and I'm thinking my eyes are just not up to scratch for manual focus anymore. So back to a EOS 3 (is this my 3rd now?) for a week as there I go walking around and I find a EOS 1N for £49. Fourty.Nine.Pounds. Grab that, sell the 3 and make £50 profit. Did I just have a free 1N? Done.
But not done. The 1N is great...but heavy. And big. Just like the 3 and 1V were. So...here's the solution. An EOS 30. See, if only I stopped buying cameras 15 years ago I would have saved myself a bit of money (admittedly not that much since I hardly ever make a loss worth mentioning when buying/selling gear).
The end. Oh no wait. See, I wanted a macro lens a few months ago. I could just get a macro on Canon mount but there I am looking at an F3HP and a 55/3.5 micro for less than £200. Which is roughly the cost of a reasonable macro lens for the Canon. So now I have the F3HP. And that 50/1.2 kept winking at me so there it is too. And while I'm at it...I really like the shots from the 85/1.4 (had one with the FM2n and F100). So I'm looking for one of those too now. And if I find one...well wouldn't it be great to have a AF body for it, say a F100...
At least the EOS 300 has always been there for me.
DOES IT EVER STOP?