I like this idea.If the idea is truly to encourage new blood into the comps then why not give 1 entry in to the comp with every show entry.
Watch this spaceNot sure the prize money will get to the level it needs to to encourage people to travel from abroad.
I'd say the two kind of go hand in hand. Large prizes will incentivise (some) people to travel. That in turn adds WPPRs which incentivises more people. More people builds the prize pool, and so on. Above all though I think you want a high quality tournament that people can trust and enjoyQuite a lot of brits travel abroad for comps, but how many choose which comps to go to based on the available prizes. Larger amount of WPPRs would probably be more incentive than larger cash prizes.