This is issue already pointed out many times by different user. If I remember correctly, The last time withdrawal fee is more than that amount in BTC they are adjusting it but not regularly because the price is very volatile. You can always choose different currency to deposit in the casino if you can't afford to pay that amount for your withdrawal fee. Wolfbet main account is not that much active in the forum since there last post here was last year while they have brand manager here which is not always online. Sending directly this concern on there support is much faster rather than wait for there reply here.
The good thing about this casino is that they support multiple cryptocurrencies and this makes the issue on BTC withdrawal fee less bothering. If we knew to ourselves that we are a small player why would we bother using bitcoin as a currency to gamble when its obvious that BTC fees are always high no matter what is the status of the market? Or no matter which is the casino we are playing with.
For the big players, the fees in BTC is not really a big problem to them. Big players are the reason why there are casinos until now that set extra high fees on their BTC withdrawals because they know that big players wont complain with it.
I think there is a solution for small players as well. They can use the BEP20 network to avoid huge fees. I am also using it.