How much do publishers get / game?

[auroragb]

How much do the retail price actually go to the publisher? 50%? More? Less? Would they differ %age wise from platform? Ie. would a Wii game publisher get $30 of the $50 retail because they get 60% and a PS3 publisher get $30 of the $60 retail because they only get 50%? How much is typically spent in game promotions? print ads, billboards, etc... Are there places that track budget of game projects? for example many sites track cost of feature films, but I haven't seen that for games...