pigdog: I don't think you're the only one resolving to not buy new games to add to a back catalogue. Thing is, the deals on here make it easy to spend a few $'s and in my experience, most are value for money. Not keen on the Android market. I'm old school and prefer a laptop than a tablet in front of me.
Anyway, I think you'll succumb to the temptation.....sorry for not helping your cause!
It's okay. People buying games the don't play still lands some money in game developer pockets, so if you help that cause it's still all good.
Regarding value for money, there's very little value in games I don't play, so I can't say that buying any game is good value, even if it's cheap. I have hundreds of titles on my backlog, and they all have pretty low value because I'm not playing them.
As for Android, well, I do think that PC's are more convenient for most types of games, but tablets have benefits in portability which is currently important for me. I'd frankly prefer a full Windows tablet (but still small), which would help me cut my backlog down a lot more, but there's still nothing good in that market. This might change soon and I'm following the market to see how it develops. Something like Microsoft Surface RT but at 8" and with full Windows is kind of what I'm looking for.
Leroux: That's probably true for mediocre games, or games you're only interested in because they're on sale and appear to be dirt cheap, yes.
I think most people try demos when the have interest in a title, but it's not strong enough to but it without checking it first. So the demo has more chance to convince not the buy than convince to buy. I've read that games with demos tend not to sell as well as games without them. Presumably people are willing to risk some money just to buy a game without a demo, which for a game with a demo they'd check the demo out, and reduce that risk.