I would never pay for a game. I do not even enter games that you have to pay GMs to enter.
I have no idea how this problem could be fixed. I think that if there where pay for play matches, they would need to have several things to make sure that the player knows what they are about to get into.
It is a little unfair that the GM users can just pay for GMs to win a game. But the way me and other players get back at the GM users is try to make it the most expensive game for them. After all, no one would empty their bank account just to win a game.
However, think of it this way, the GM users made supremacy1 happen by buying GMs from supremacy1914.