I am neither a gamer nor a game collector. However, the size of this collection and the effort you put in to amass it are incredible.

If the only reason you want to sell this collection off is to get more money that can be invested in improving emulation for European and Japanese sets of the games, would not a KickStarter/Indiegogo campaign be a better idea?

You would get to keep your prized collection, while the emulation efforts get funded by people who would benefit from it.