Neither reason, albeit I have a launch dreamcast and enjoy rare games =)
I was about to shell out 250€ for a new vidcard and told myself fuck pc gaming and mandatory hardware upgrades. Bought a 360, december 2005.
Two years later I replaced my obnoxious pc box with a 24" iMac.
These days I game on my 360, everything else on the computer (ok, I do play diablo from time to time =D).