Only digital when it is time to upgrade, i've bought and sold hundreds of watches over the years, i've done the whole collecting thing and realised as far as cameras are concerned I would just rather have a nice little group of "users" and try and not get into the trap of constantly buying and selling, I just have to make sure that what I buy is something that I can see myself keeping and is not just a buy for curiosity value (says he who just bought a charity shop Minolta X-700 - Doh!), although I would like to trade up my Yashica for a Rolleiflex one day, oh and of course upgrade some of my lenses.
Cheers, Richard