Interesting thoughts. Well, I was never raised to believe that items can make me happy. But some material things do make life better, others are inevitable. I like how Buddhists call belongings 'attachments'. When I clear the shelves of possessions, and find new homes for things I haven't used in a long time, I feel free. If I purchased a Leica, something within will compel me to get rid of the Pentax, because owning two 35mm cameras of similar size and function would seem redundant to me.
But then it strikes me that the Pentax can do some things the Leica can't, like macro and close-up work, take very long lenses, or ultra wide. So why do I want the Leica again? It was very useful for me to own and use one for a while, it was sobering. The 'tickle' was very nice, but it didn't last. And instead of spending a few thousand dollars on a wonderful camera, three lenses, case, and accessories like shades, caps, and filters, I could spend it taking trips, or on improving my darkroom setup, etc. It isn't about the amount, but it's about spending money on something that I now believe I don't really need.
When I'm rich and famous *grin* I might think differently. But for me I feel privileged to have had a chance to use a camera like that for a few months with no pressure to purchase it, and to discover what the allure is, something that usually comes with ownership. I would hate to have spent the money on it, only to find myself with the 'empty' bucket of feelings I have for the camera at this stage.
For now, critical thinking wins. But later on, who knows? It's such a gorgeous, wonderful, fantastic camera to use. It is amazing. Don't get me wrong. It does nearly everything better than the Pentax, and within its limitations I think there is no better camera, but not where it counts unfortunately - the lens quality and the resulting pictures.