I would also advise in the opening parts of an interest check to offer medium/fiction/etc that the rp may resemble in a way and that, if users enjoyed those, they may enjoy the rp too. It sort of bridges the 'people know what they're getting' aspect of fandom media and making it easier to progress into reading and digesting the user made setting if they have an idea from the outset it might be something they'd enjoy. Seeing a large ooc full of information becomes less of a turn off if I know it might be something I'd enjoy.

Kestrel is right in that dumping a buttload of information from the outset is not a good idea and that it should be dripfed into the narrative where it's suitable and neccessary, it's [b][u]far better to show then tell[/u][/b] and having it relevent to the ongoing plot and IC at hand and the characters people are playing is far, far better then expecting someone to read a world bible at the start. Also, GMs should be prepared to make allowances for interested players to present characters and ideas that don't fully match the rp's lore and to actually be understanding and accepting of that rather then possibly nitpick and tear things down - afterall, an rper doesn't the lore as well as the GM does. Obviously if it contradicts with the main important parts established in the ooc that's one thing, but if it's otherwise a minor detail that is not going to affect the current rp campaign then it should be left alone and accepted.