Casino Rewards isn’t rev share, it’s based on wagering. Same as the brick and mortar casinos in Vegas. The positive here is that you get paid a percentage of every wager as long as the player plays, regardless of wins and losses. Personally, this is my preferred type of compensation. For instance, a slot player pays for 100, wins 1000, then plays the 1000 back – you get paid your share of 1100. Should he win again while using the 1000 win, you get paid on the additional play that results also. And so on and so on.
I am not working with Will Hill, but it sounds like you are paying for some bonus money and no matter what program, you should be able to see in your stats if your player deposited. Most places (other than Rewards) you get a percentage of player losses, and some items are deducted from this, such as bonus money etc.
It pays to read the terms and conditions of each program carefully, and to also keep up with posts here, because some deduct huge amounts opf bonuses, or fees they owe to software providers, or percentages of progressive jackpots etc., while others keep this low.