How many different cameras are you using?

...these forums for quite some time now and I believe he's gone through a wealth of cameras just like I have.

As for me (with over 40 cameras currently sitting in bags and/or drawers), I can say that I still use them all - some of the older models not so much anymore, but others, more often.  So my vast collection, in this instance, is a combination of collecting (and holding on to) cameras I've loved using in the past and which I've had some emotional involvement with - along with having newer version, which pique my interest.

So right now, this seemingly irrational "emotional involvement" is centered around 4 mirrorless systems, and some older models.  These include M-43, Fuji X-Trans, Canon EOS M, and the Samsung NX mirrorless systems.  Then there's the older regular Four Thirds models I still maintain and some point and shoots by various makers.

There are those us who have sold some really excellent cameras in the past - only to have subsequently come to regret doing so.  I know that for a period of time a decade or so ago, I'd sell a camera if I wasn't using it much.  And I sold some very nice cameras in the past, only to later begin reviewing images taken by them and realizing that it was a huge mistake for having parted with them.  Then in most cases, I'd wind up looking for the same models again - sigh.  So I don't do that anymore.  If I really enjoy a camera, it stays now.

Heck, I still periodically shoot with the ole' 5 MP Olympus E-1 (with Panny-Leica Vario zoom lens).