thats not a rain anymore if your going to pay but that is your money that you are recieving in the form of rain and whats not good is that you buy coin with your own money and didnt get the full amount of coins but instead it is being distributed every 20 minutes ?
if that is the case and if your in a hurry to gamble you better buy coins in a regular exchange but i see this isnt a problem if you have lots of patience and if you want something new in recieving your funds .
It's still considered rain because you get back additional money after wagering, and not just rakeback.
Also, there's also free rain which wagering is not required.