The number 1 criteria for whether I want to add a game to my collection or not is if it looks fun. I intend on playing and enjoying (hopefully) every game in my collection someday. While some of these games do fall into the rare category, that is not my primary motive for keeping them. If a game sucks, but happens to be collectable it really means nothing to me; I have no desire, ever to own Action 52, Cheetahmen 2, Stadium Events, or any other rare game that is known for being complete garbage. Even games that I collect thinking they'll be good and when I actually play them and don't like them, i have no problem selling them. The most famous example of this is Earthbound. Did not like it so I sold it, can't say I miss having it either.