Is a really big bussiness, mostbacker dont have prior personal relationship with their stakee, but its not like they staked anyone out of the blue, there´s has to be a reference/reputation check first, in fact i think there´s a big skype group for backers when before signing someone the post it in there to check if someone was previously staked by somebody on that group, thats how pretty much goes, u need for reputable refereces in the comunity, do some background check on the player, visit some other forums (ask for his other alias), etc., their results is like a seconday thing for backers, the most important is to reduce the risk of getting scammed, cheers.