Nope, as long as you've done all the DIK moves throughout the game (Quinn's restaurant for Riona and Camila scenes) and you're a massive DIK (required for the hot tub scene) and you're on the you're on the Sage path (for Sage obviously) you can do everything at the prep party. You have to pay for Lily though, if you're a Chick she gives it to you for free. Obviously M&J antics wouldn't be in this playthrough.
I don't think he's a "major" dealer. Bud mentions his methods are better than Quinn's. Sounds like they are on a similar level, he's just managing to sell more ("beating her in volume" as Bud puts it) due to his methods.
I don't get why suspecting Vinny is "absurd". I get it that you're not sold on it, cause there's not enough background info to explain why or how. But "absurd"? There are clues, or red herrings, all over the place pointing at either the Jocks or Vinny but nothing conclusive.
If we say it's the Jocks, then the questions come up:
- How did they know the DIKs were going to go away from the mansion? They have someone watching the DIK mansion the whole time? They've set up surveillance cameras nearby? They got lucky? There's a mole inside the DIKs who's helping the Jocks? None of these are convincing.
- Why did they spray paint their logo on the walls, incriminating themselves? They are idiots? Not too much of stretch there, but I doubt it.
- Why was Nick's the only room left untouched? Because the Alpha's ran out of time to trash it? Because they overlooked it. Because they knew it was Nick's and they wanted to frame Vinny (not likely since they spray painted their own logo everywhere).
They definitely have a good motive, no denying that. Shit between the Jocks and DIKs is just escalating.
If we say it's Vinny the questions are:
- How did he know the DIKs were going to go away from the mansion? Nick told him? Why did Nick tell him? What did Nick expect Vinny to do?
- How'd he know about the dildos? Nick told him? That one seems obvious. He could have just mentioned it in passing if they are still catching up as friends. Are they catching up as friends?
- Where'd he get the dildos from? He bought them? (That'd be kinda uncomfortable at the counter - "I'll take the 30 dildos thanks. Yes I like different sizes depending on my mood. Would you mind keeping your voice down please, sales clerk.") He stole them from the Jocks? That wouldn't have been a piece of cake. The Jocks threw them out and he collected? The Jocks gave them to him? None of these are really very convincing.
- Why did he do it? Revenge for something we don't know the full details about, but there seems to be bad blood there, at least with Tommy.
Are there any significant clues or information pointing at any other parties?
I hope you haven't been scouring the prep mansion looking for some beverage that doesn't exist!