[lgas]

In the one I played in they paid 6 spots, and the prizes were something like:

1. 1800ish
2. dunno.. gonna guess ~1000.
3. 650
4. 450
5. 250
6. 205

So if there were 91 entrants, that's $5,915 brought in, and $4,355 paid out, so $1,560 that they kept, or about 26%.

Since I'm not sure of the 2nd place payout it might be closer to 30% or it could be closer to 20% if they were more generous with 2nd (I doubt it).