Is it the case that there is significantly low support for the game, and is this why I always see the same 618 levels in the BBS list, or is that because there was only one chance to have user levels uploaded? If there is a support/activity problem, what can be done to help that?

I let the BBS activity dwindle a lot over the last year while working on the next (and final) iteration of the engine and editor tools. I posted about it in the other thread here.