Minimal prize support? Everyone got R1 and R2 rulers. These seem to be ~$8 each, so that's $800. Then there was the kit itself, which I believe is $160. Then there were what seemed to be 16 trays, which seem to be $20, so another $320. So, for the $3000 collected income, they were spending $1280 on prize support. All of which was announced beforehand. And as it turns out, they only collected ~$2100 of it, but still had the full cost sunk. Tell me, would you prefer to go if they were charging $20 and offered no additional prize support? Because about $12 of your $30 went towards prizes (assuming the full 100 people). And that's not even counting all of the overhead, staff and opportunity cost to run the thing.
Now I won't deny that I probably won't be returning next year. It was the furthest I've ever gone for X wing (including Gencon), had the most in tolls (stupid Chicago), and the highest entry fee. But it wouldn't be because of the $30 entry fee.