The obvious answer is lower price = more chance of success.
Thinking along those lines... I wonder if the larger value sets would benefit from a larger total ticket pool. Most are capped around 100. I don't think I've seen anything over. Just for example sake, I think if
@Chbyfngr would have had the Bahamia set @ 200 tickets for $18 a piece he would have gotten a lot more action. For me personally, the price has to feel completely insignificant given the potential total gains. (I know that a single ticket vs total set value is always "worth it" if you win... but obviously we all have that threshold of when it feels right to gamble.)
The people who are happy to drop $100 on each raffle will still get the same equity, but people with their pockets sewn shallower by their wives and kids and circumstance will be able to jump in too, at least on average, more often.
I may be way off base here, just thinking out loud.