Even you will sue the ETH, BTC, or LTC, the withdrawal fee was still the same, it is I think ranging from 6-8$ while BTC is on $10 which is still good enough.
How is $6 - $10 good enough? It is unacceptable in my opinion. Some crypto gambling sites charge zero withdrawal fees while some others provide various options(Slow, Fast etc) to bring the fees below $5. Roobet needs to improve in this aspect.
^ You have a point that they need to change this aspect, as I said good enough because there is no minimum withdrawal upon withdrawal your balance not like other services that have a minimum withdrawal high than Roobet withdrawal fee. However, gamblers do have not the same opinion on this, and probably others with the $6-10 range is quite small for them. But this is my opinion different from your opinion and we have different opinions.
Nevertheless, fees do not matter to me as long I can play anonymously, but if not, I don't care if you have a free withdrawal fee, a lot of bonuses, sorry.