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.
You and the people who feel that $6 - $10 fees are low are part of the minority since the majority clearly feel that they are high. Sites like Bitcasino literally charge zero withdrawal fees. Roobet is definitely lagging behind in this aspect.
Also, you aren't playing anonymously on Roobet. Did you completely forget about their recent mandatory KYC changes? Check some of the posts above.