His motive is probably revenge on the DIKs. He was one of the founding fathers of the fraternity and wanted to be its leader. He couldn't oust Rusty from this position, because Rusty was the only reason the DIKs could afford their mansion and lifestyle, so he tried to take the position of vice-president from Tommy. He probably never did it formally, but managed to de facto take on himself Tommy's responsibilities, which we see in Tommy's flashback before he hit the MC. We don't know how the conflict later played out but obviously Vinny quit the DIKs, leaving behind his loyal 'agent' (Nick) and a hidden camera. He is responsible for both trashing the mansion as well as leaking photos of Arieth x DIKs and Chad x Troy to the Jocks. His main goal is to destroy the DIKs entirely through a feud with the Jocks and the Cathy scandal. I suspect he also wants to take over the drug business from Quinn, even though she was probably the one who introduced him to Buddy in the first place.
I'm almost 100% sure of everything I wrote up to this point, but there remain two main unknowns in this whole situation:
- What is Stephen Burke's relation to Vinny?
- What is the mystery behind the black box?
The second one is currently too hard to guess, but when it comes to Stephen, I suspect he doesn't possess a direct access to the DIK laptop. The Jade video was probably leaked from that laptop to him by Vinny (possibly with Nick's help). I don't believe that Stephen consciously cooperates with Vinny. I think Vinny leaks him the video for the same reason he did the Cathy cluck - to stir shit up and create troubles for the DIKs. Stephen doesn't have any grand plan, he only uses his position to bang girls, possibly with the help of Quinn/Priscilla (acting as a pimp). And the Jade video is of interest to him as a possible leverage against his wife if she ever tried to divorce him.