I've gotten rid of nearly every single 'retro' console besides the Dreamcast and it usually sits in it's box unless I get the urge for Crazy Taxi. I figured I would try emulators for a while but I found it even less interesting than playing games on the original console.
Another possibility is I simply don't have nostalgia for most of the games I own. Being a younger member (relative to the general demographic of the site), most of my nostalgia is for stuff on the PS1 and early PS2. Problem is, as a kid, I played the hell out of all my games. So while I can find it fun to look up and watch a video of a game I had as a child, the idea of playing it makes me physically sick. I couldn't imagine sinking another minute in Gran Turismo or Tomba.
This has caused me to think that it's possible that retro games just aren't my cup of tea. Maybe in 10 years when we all look back at the PS2 as an archaic console that used physical media and physical controllers.
Now, I've had great times with lots of old games and have fond memories now of many games that I would have never played if I didn't start to look into older stuff. I just don't think I can really find it enjoyable anymore.
Anyway, I hope I didn't bore any of you to death with my rambling.