It is your collection, do what you think is right. I had started out to set collect, and I was 500+ deep in NES at the peak, with 200+ on Genesis, SNES, and 100+ on N64, Xbox, PS2, and 360. Like you I also have no kids to pass down the collection to. I decided to only keep the games that I wanted to play or had sentimental value, childhood Christmas presents and what not. I have no regrets about it, and I cleared up a rooms worth of space.