I've got 20.
It started quite "normal" with iRex iLiad, one of my all-time-favorites.
Then of course the famous Sony 505, now a real classic.
Being so fond of iRex iLiad, I had to go for iRex 1000. And here it started. I guess, in total I may have used iRex 1000 about 5 to 10 hours. Before I actually could get into it, I bought the next one. And the next one.
At some point I got more exited about comparing features and setting up my new devices instead of just using them...
Doing the very same (comparing, setting up, ...) is even more compelling for tablets. Unfortunately, they're a bit more expensive.
BTW: I've always been a collector. As a child it was paper books and comics (about 8.000 I guess), CDs, DVDs, iTunes movies, apps, ...
Well, at least I know where my money goes.