For me it would come down to playability and longevity. I've been in the hobby long enough and have sold off enough games to know what I will play and not get sick of. Its nice to have more expensive games, but if they just sit there as bling whats the point? My grail is AFM but i'll probably never own it because its just way too expensive for what I will get in return. On the other hand I also sold my WH20 years ago and have been pining to get one back so regret in getting rid of a game you may be sick of right now but ultimately realize you made a mistake and want it back.