Is there not be little compensation for those that wagered and couldn't meet up the 20th position? @Ben
Never seen any wagering contest where players who are out of the paid places get a small compensation. If a casino do it, it may cost them some more money and it can be abused by some people as well just by wagering low amount to get the compensation.
The bottom part of the leaderboard changed very quickly the last day. I thought I was going to win an easy $50 just betting a little bit and chilling but got totally denied. From $200 minimum and 15th place to $1,325 in one day.

This is the art of wagering contest if you ask me, although you are on top 3 or top 5 earlier or even you are on the top place (1st), there is still a chance for you to be kicked from your position in the last hours (even minutes) by whales who can bet huge amount easily.