yeah, these are my thoughts. people are naturally going to want to extend their invites either to friends, to castmates, or to characters they recognize and want to play with, so by default there are going to be fewer invites by number to go around to anyone who isn't one of the above.

it isn't that people aren't going to enjoy playing with obscure canon characters or ocs on the tdm, it's just that when it comes down to giving out their invites, they're much less likely to pick those over a character they know and want.