I'm around the 10 mark as well, and most of my bodies have a purpose, or apply to a particular mood.
The three most important ones function as systems for specific purposes:
Mamiya C330 (3 lenses): my top image quality setup, when I want to have big negatives with lots of details and beautiful tonalities.
Nikon FM2n / FE (3 lenses, motor drive) : when I make those 2-day, 60 individual portraits contracts (gotta love the motor drive and remote), redundancy of bodies, and also when I need to go anywhere not perfectly safe (hot/cold/high/low/far/etc).
Contax IIa (5 lenses) : my "precious." Camera and lenses that exhibit amazing quality for 35mm work, jewel-like precision, lightweight, walkabout all-focal-lengths-covered kit, 35mm slide shooting. There's a Kiev 4a with a Jupiter-12 that works as extra. A good holiday camera, but also a good "Moleskine" camera: the one that has the rich leather binding to keep your most precious and profound thoughts as you go about in your life...
The other ones are individuals to fit a mood.
Praktica L : it's my first camera ever, and I keep it to use a Helios 55mm f/2.
Minolta Hi-Matic: Whenever I feel like a Japanese tourist. Vacation camera. One lens, quick focus, quick setup. Fun for slides too.
Agfa Isolette II : Whenever I feel like a German tourist. I snatched it free from the good soul on APUG who repaired them and gave them away for free. Works great to practice evaluating distances.
Brownie Hawkeye: Whenever I feel like an American tourist. Really just for the purpose of using flashbulbs, and making the occasional family snapshot à la sixties. And the amazing feeling of simplicity.
SoHo Cadet: Whenever I feel like a British tourist (that's rare nowadays). An old bakelite folder, with two focus positions (near and far) and a fake diaphragm opening. I used it to do 6x9 contact prints, some vaguely experimental multiple exposures, and more vacation pics. I haven't used it much, so it's more of a shelf queen ("wow! what a weird camera!").
Zeiss Contina: cheapie scale focus 35mm with a crappy lens. Haven't extracted anything good from this camera, and I got it for peanuts, so either I throw it to goodwill, or I try to find how I can best use it.