I think that the owners of these high withdrawn fee casinos don't want to have customers
I see the problem as a vicious circle. The casinos don't have enough players, so to make money, they demand high withdrawal fees. The players, on the other side, don't want to become their clients because the withdrawal fees are too high. Even if both sides suffer in this scenario, it's the casino that is the ultimate loser because less and less players will play there.
I can't remember ever seeing someone recommending BetHash as a casino they should check out. If their team intends to keep it that way, they should follow the path they are currently on and nothing will change.