Do you? I collect PS1 and PS2 games. I don't know why, I just do. Maybe it's the nostalgia based around them. Maybe. Probably.
I also collect corpses, but that's not important right now.

I have a fine collection of dust that I'm afraid to move because it makes me sneeze

I seem to collect games. Given the number of ones I've got right now that are essentially unplayed (never mind unfinished) I think that the only logical explanation is that I'm collecting them.

Same here.

I also collect games. I wish I could collect Time.
I used to collect keychains, though only had about 300. Oldest I have is from the mid 1950s, newest is probably 1999 ish.
But it got to the point once where anything fancy and quality was too expensive for a teenager on a budget and flimsy 50c ones are, well, crap. Thought about returning to it now I can afford a hobby. But it's hard to find anything good without shelling out a fair bit of cash.

I collect and have collected lot of things in the past. I had extensive of PC games but sold most of my old ones to collector just couple weeks ago. That included some 100 good condition cardboard box games and around 10 collection boxes. Probably over 150 games in all. Only cardboard box games I spared were cRPG's (baldur's gate, arcanum and the like). I've also been selling some other collections at summer flea market since last year (including DVD video and game collection among others). I still collect Manga, Anime (well all ghibli production anyway), hard cover Donald Duck comics and fantasy literature. I'm also sucker for all things japanese.

Ditto.

And same here. Right now I have more than 250 genuine PC games.

Whoa, I hope you don't wind up regretting any of that. I've sold or otherwise mislaid some old games I really wish I held onto now. But never that many in one go. D:
Good to know I'm not alone. I'm definitely trying to focus on actually completing some of these games now. Rather than just play them every now and again and wind up formatting the computer before I've got anywhere with them.

I collect lines.

Steam says I have 138 just on there. D: I know that's not strictly true as it's counting episodic games, multiplayer components, DLC, free stuff and various development kits as games too. I've basically only spent over £20 on two games in that list. Most of it's insanely cheap.
But even so, that's still quite a lot. Especially when you add that to my GOGs and the few Gamersgate, EA Store and Impulse games I have. Then there's retail....
So yeah, 250 isn't so bad, right?

Yep - games of all sorts. I've bought over 80 games from GOG plus have countless games from my 20+ years of playing on the PC. Additionally, I love MAME and console emulations. Plus, for some reason I've been on a console-buying kick over the past year (Atari 5200, Intellivision, NES, SNES, and Sega Genesis). Last week I bought my first Sega Dreamcast off of EBay plus some games. The games have just started coming in and I'm looking forward to trying out the system.
Then I also have the requisite CDs and DVDs (just got rid of tons of videos to make room for a MAME cab that I'm getting at the end of the year).
Needless to say, I have a fairly large office at home and a tolerant wife. When we bought our house the agreement was that I got the large office for my "stuff" and she got the rest of the house to do with as she pleases (she's a saint :-)).
- Jim -

Well I do regret I had to do it but I did not have much of a choise. They simply took too much space and considering most of them were stored at my parents house I could not justify them storing them much longer. It's certainly better fate than my C64/C128 and Amiga 500 games faced being carted into rubbish dump few years back. It's better to sell them or even to give them away than put them in trash can.
I know that I could have sold them for lot more than what I got from them but that would have required too much effort from my part (putting them sale on the net, correspondence with prospective buyers, monitoring money transfers, packaging and mailing etc.). I do like selling in flea market but very few is willing to pay good prices or even buy whole collection for that matter even if offered relatively cheap. Well in my home city anyway, flea markets vary greatly from town to town. Unfortunately I'm restricted to where my father is willing to take my stuff as I don't own a car of my own (and havent driven since getting licence).

Yeah, it can be a lot of effort. I used to sell quite a bit through eBay and it can be a job keeping up with it all.
Some old games go for a small fortune on eBay. Others aren't worth anything much at all now. It's difficult to predict what would be auction-worthy to be honest.

I collect only the severed head of my victims. Everything else goes in the river.