Beautifully put. But it seems that quite a lot of people do not, in fact, buy cameras to use. they buy them to try, to play with, and to sell on. There's nothing wrong with that -- most of us have done it -- but it strikes me as a cardinal error, when you are passionate about taking pictures, to make any more compromises than you have to the camera with which you are hoping to take your best pictures or even (in my case) that you are using as part of your livelihood.
'Any more compromises than you have to' has normally come down to money alone for me, which is why I don't have an S2 as well as the M9. But worrying about depreciation is something I've never done, even as a professional. No 'serious' camera I've ever bought (as distinct from cameras to play with, or cameras to buy and sell) has ever been bought with the idea that I'll be selling it in a few years (or even a few months). Rather, it is fully depreciated in use, and any residual value is a bonus. Or would be if I ever got around to selling my old 'user' cameras that I've used to help earn a living.
Cheers,
R.