I would love a market that would bulk buy my crappy non selling files for a price.
Oh, wait, then I would have to let 95% of my port gone forever!
Anyway, jokes aside if there was a real, actual, creative team that posted briefs from clients and not "we heard", "our search", "they ask" i would be interested. But this is alρeady covered from other sites like tongal, etc. Take a look at OVC onlinevideocontests or for more advanced check Youtube creative something brand partners (sorry I cannot recall the name or link of it) services, quite many agencies that give briefs to freelancers or individuals to shoot and edit in exchange of a fixed budget. Not really transparent, you don't get paid for a concept or for an original idea. You don't always know who won or if payed (perhaps a false statement / that is what i believe).