How often do you buy/play downloadable games?

I'm talking for the 360/PS3 and the Wii here. And then the next question is, how often do you even play them now? I remember when I first got my 360 I went a bit nuts buying the Arcade games. I think I have over 30 of them. I remember playing Heavy Weapon online for hours every damn weekend. I think we all here had a bunch of games together as well with that one. The same thing happened when I got my PS3. I have well over 30 games in there as well. It's the same thing with that system, I play the hell out of Super Stardust HD and that's pretty much it. Now I will play other games that I have purchased but not in the capacity of the two mentioned. The sad thing is the "impulse buy" game purchases. I remember buying Q-bert almost day one on the PS3 and I may have played it once. That wasn't a purchase for me however. So I have well over 60 downloadable games and I pretty much play 1 or 2 max religiously. I can't even remember the last time I played any XBox Arcade game I purchased. I believe it was around the time I got the PS3 so it's been quite a while to say the least. I never even started with the Wii stuff.

I do remember many of my Arcade purchases were due to the idea of Achievements but since I gave up on those way back I think that's what has slowed me down on my purchases there. My PS3 downloadable games mainly started as I had this system with no enjoyable disc based games when I first got it so I built up a decent library of games that way for cheap just so I had something to do on it besides play movies and PS2 games.

So what about you?