The following systems i have:
Atari 2600 - a few different consoles, one of my bigger collections but going to sell it since i rarely play on it.
Atari Lynx - Both versions, a few games like it.
Atari Jaguar - love the system only have 4 games and 1 cd game that i can't play because i haven't got the cd unit.
Intellivision - this got me started collection videogames. Found it at a local 2de hand shop. a handfull of games.
Collecovision - has a broken joystick port. Only played it a few times. 7 games or so.
Philips Videopac - played it a lot back in the days, but selling it because i'm switching to the newer generation of consoles.
Philips CD-i - like the shooters like maddog mccree.
Sega Mastersystem - Both versions. Has some great games.
Sega Megadrive - First and second version, like virtual racing.
Sega Saturn - Both recently and play it often. Only have to fix it since it get overheated.
Sega Dreamcast - i was very impressed by the system. Has some great graphics.
Sega Gamegear - my first handheld gaming device. Played it a lot back then sold it regred it both a new one. Have to fix the speaker.
Nes - Gets hardly any play got a dozen or so games for it.
Snes - Has some great games, but again hardly play on it.
Nintendo 64 - Has some fragile joysticks other then that i like the zelda games.
Nintendo Gameboy color - currently my newest handheld.
Sony Playstation - My first console i bought, got sick of upgrading my pc every year or so.
Sony Playstation 2 - Most of my time i sent on this console. Love racing games and above all gta-sa.
Microsoft Xbox - only the console. It's a us version and somebody blew the power supply.
System 1294 - got it on a flea market newer played on it.
Commodore Vic 20 - 1 game no power supply. I don't know if it works.
Commodore 64 - Played a lot on it my friends and family. Men those loading those games did take a long time.
Commodore amiga 500 - A few computers again played it a lot at friends.
Atari 800 - 11 games.
MSX 2 - got a few msx1 and 2's love the konami games.
Laser 2001 - a rare system, working.
Comx35 - a other rare system, got a built in joystick.
Apple lc-II - or LC-III don't know.
Philips :YES - one of the few computers that came with a intel 80186 microcontroller.
Well that will be it i think.
One thing that helps (which I don't consider a good thing though), is that I'm not married or living with anyone.
Surething it helps a lot.

Or you have a girlfriend (or wife, i think he got merried) like steelballs that likes collecting to.