At the peak of my collection, I had 249 NES games in the box. They took up most of a wall of my bedroom. It was awesome.

I definitely agree that they get to be a pain in the ass to move around, though. And yeah, it definitely sucked selling them all off, but it had to be done. I kept most of the ones that I still play on a regular basis (all of the Mega Mans, Super Mario Bros. 1-3, both Zeldas, Metroid, all three Castlevania, and a couple of other random ones), and I've since picked up a few games again from garage sales (sadly, not in the original boxes), but I just can't afford to spend that much money on games anymore. What with rent and all that. Although once I quit smoking and cancel my cable, I'll be saving about $200/month. Might use some of that money to start collecting again.