Dante calm down for a minute; you may be a little out over your ski tips on this one bro...
So essentially, you're wanting to bet someone 1000 dollars that the plates are real? So if somebody comes down there and finds no fake plates in the gym, then I'm assuming they'll also get to drop 675 pounds on top of Brad's chest again and film it so we can see how differently he handles the task using the verified weight? You'd need to do this because if there were fake plates before, then someone could have simply removed them from the premises. Does the person verifying the plates also get to spot Brad so they can relay to Getbig approximately how much they had to help him in the negative or the actual lift if the two of them can actually get it up before his chest cavity explodes?

Squadfather's point here is that if there are 5 or 6 other intermediate-at-best lifters in that gym posting YouTube videos of them pushing that kind of weight, wouldn't it stand to reason that they all probably have access to the same modified Olympic bar/plate set-up and that Brad was probably also using a false prop when attempting to portray himself benching near world-record weight in that video?
I think you're actually trying to bet someone 1000 dollars that he has awesome genetics and that he is "pretty strong," which are terms way too ambiguous for a bet.