How do you distribute prizes for paid challenges of the day?

Here is how paid challenges are paid out:

• Rainmaker Games fees
  • Rainmaker Games takes 20% of all entry fees; the rest is paid out as winnings, along with boost prizes
    
    
• Eligibility
  • Only players who complete the required qualifying matches are eligible for prizes.  Players who don't play the required number of matches do not win any prize money.
    
    
• Standard winnings
  • Players who score on or above the 50th percentile win, and receive at least their entry fee back, if not more
    
  • Players who score below the 50th percentile get nothing
  • The distribution of winnings to the top 50% of players follows an exponential curve, which gets steeper the higher you are on the leaderboard.  This way the top players get significant prize money, even though everyone in the top 50% is winnings.
    
    
• Boost prizes
  • In addition to entry fee winnings, the top 3 finishers also are awarded boost prizes.
  • Boost prizes are paid by Rainmaker Games, and are 5x, 3x, and 2x the entry fee.  So if the entry fee is 200 RC ($2), the boost prizes are $10, $6, and $4, in addition to the normal entry-fee-based winnings.
    
    
• Ties
  • If players are tied, the prizes for all tied ranks are averaged, and split evenly among the tied players.  So if 2 players were tied for 2nd place, they would each receive the average of the 2nd and 3rd place prizes.