In my opinion the payout is too broad for a 50 person tournament. Unless you finish in the top 3 you aren't really winning much. Even if you win It's only about 400 credits after the entree fee.
My suggestion would be to either up the amount of players that can enter a tournament to around 100 or instead of the top 30 players getting paid, change it to the top 15 or 20. That way the people who play the best get rewarded more.
To me this would make it much more satisfying when you finish well
Cheers