A note about the tapered payouts: I think it is a good idea for every prize to be at least the entry fee. That means that if you pay a lot of players, you may need to add in a constant to make sure the minimum is the entry fee. A different way to handle that is to pay the lowest paid round their entry fee -- you don't know how many will be in that round -- and then calculate the taper for the number remaining.
How you make the decision on which is the lowest round to be paid needs to be stated. If you say "top 20" and then you have a 10-way tie for 18 through 27 the payout for those players will be pretty skimpy. I suppose you could just go with the calculation.
How you make the decision on which is the lowest round to be paid needs to be stated. If you say "top 20" and then you have a 10-way tie for 18 through 27 the payout for those players will be pretty skimpy. I suppose you could just go with the calculation.