100/700 x 15k (I’m assuming 600 tickets purchased aside for you and 100 by you, which gives the best value)
ok, so I understand the math but I'm not sure I'm mekabel the reasoning in this case.
IIUC that's essentially saying if you run this ?? times the average return will be $2143?
Here there's only one shot at it and it's all or nothing. You're not actually expecting a return of $2142. I see it as simply improving your odds of a 15k prize from 1/600 to 1/7.
(Or are you saying in vegas you can get better odds at $15k for $3600?)
ETA: I guess I should've focused more on this part of your post:
Def not worth it solely as a gamble.
You're talking about a purely financial "investment" and I'm talking about an Antarctica raffle