That's why all my vary depends on the amount you transact for that day and if you cannot afford the payment required for high fees or even low better to wait for tomorrow or in upcoming days if you don't need to cash out your funds yet and try if the network became stable since sometimes the fee's became more lower if the market is in stable situation.
This isn't something a problem that do talks alone with roobet but most gambling sites that does have dynamic fees will really be having this kind of common problem.
Even myself do have a problem on making some withdrawals when bitcoin network is hell clogged up. You would see $4 or eve $10 for a single withdrawal which
does really hurt specially if you are only making small withdrawals.For some this might not an issue but for majority this is indeed common.
The solution? Just wait up for the network to stabilize but well gamblers aren't really that patient though.