Personally i think we can go with an unlimited proxy tournament, and hopefully get whatever store we have to offer some type of chase T1 card that will attract people. Not necessarily a P9 component because most stores would consider that too high of a risk for a first time tournament, but something to atleast attract players of all levels.
Any other suggestions?
Another thought could be a store credit prize structure. An example for an 8 player $10 entry fee could be store credit to the top 4.
4th $10
3rd $15
2nd $20
1st $35
Total entry fee becomes the prize pool in store credit. This way the top players win something, the store gains, and it is highly flexible. The hosting store never loses and would be attractive in the beginning for a store to try it out.