This isn't really a place to ask for this, because there is no reason to gave those sites a free advertising. So in order to give you a names I will also provide some details in order to justify their mentioning here.
Turbosquid - greedy peoples - royalty rate 40% wich means they get 60% from every sale you get, tons of thieves, tons of stolen models, tons of unnecessary competition, marketplace that need to be contacted by a lawyer in order to remove stolen models, wich is requested by the real author or the models.
3d export - fixed 60% royalty rate for non exclusive seller, again tons of thieves etc, same lawyer thing as with turbosquid.
Renderhub - max 70% royalty rate if you have more than 200 models on sale (55% if you are just registered), site that have "game rips" section for selling models stolen from games (I should just wrote that, it would be more than enough).
Those are the major ones, and I think that you are getting the picture by now. I'm sure that more people will write here on this topic with more useful information.