the withdrawal fee is today at $ 12.2.
...
It is true that this is the best solution for now when prices are high so we small gamblers will find it difficult or pressured by high costs.
Hopefully Rollbit can hear about these complaints and soon add alternative accounts with cheaper costs at least LTC or TRX added here.
I haven't registered with Rollbit yet but adopting other coins besides ETH and BTC is a must to do IMO...
LTC, TRX, and Doge are good options, but it all depends on the developer because the disadvantage of adopting 'low fee' coins is the withdrawal that users will often make.