I guess I sort of do that, at least with digital games. Like others have mentioned, I mainly pick up games in bulk during sales. However, I'm a big physical game collector, including games I buy purely for nostalgic value and have no intention of actually playing through completely. So given all of that, I have roughly an
18% completion rate for my game collection! If you take out games you don't really "beat", like various sports games, some puzzle games,etc, that percentage might go up to like 20% or so. Either way, it's still pretty low! But oh well, I enjoy the collecting aspect of things, so to me, that's a kinda metagame. I do need to stop buying random PS1, N64 and Saturn games though...