My biggest issue with Dez coming out of school is he had 'homeboy' problems. I don't mean that in a derogatory fashion, just in the sense that he had about a dozen lackeys with their hands out. Dez feeling loyal, as he's never had a family - this was the closest thing he had. When the well dried up, and the money stopped - these guys looked for any way to extort the man. Some friends.
Now they're shopping this video, that may or may not exist. I believe Dez did something stupid, these guys were there, and are threatening that they 'may' have evidence. If they really had it however, they would've already turned it over to TMZ, ESPN, etc someone willing to pay several hundred thousand for it.
Unless Dez already paid them off. This video could potentially cost him tens of millions of dollars, why not drop 500k to save 30 mil?