I think creating or building an ETH casino is not OP's goal or purpose but rather looking for opinions if playing in Ethereum casinos is somehow convenient too like playing in the usual bitcoin casino. We really are concerned about gas fees in ETH and I think there will be no solution for it for now. Depositing ETH to an external service will likely cost a huge fee compared to usual.
The only advantage of using ETH casinos, as I mentioned already, is the ability to link our own wallet like Metamask into the platform making the deposit cheaper and much safer. But I doubt gamblers really prefer that way that's why it's now up to OP if he will test the experience of gambling in an ETH Casino.
Well in that case I think it's best not to try ETH casinos at first place.
Firstly there's a risk that not all casinos might be genuine, some may even run away with our coins.
Secondly, if we don't have a control on ourself from gambling then we might end up gambling all that we have in our wallet.
So these are some strong reasons why I wouldn't use a ETH casino.
It's better to deposit a small amount to gamble and then make the other deposit only when it is all gone.
For a new casino it's advised to check their reputation and if ever you are willing to play on them, start with smaller amounts only, in case we are right that they are a scam. If you know that you have a hard time controlling yourself or if you have some kind of an ocd like if you're obsessed onto something else then you better not play gambling at all, as gambling requires money.
For me I also have a strong reason on why I won't gamble on a eth based casino, that is because I found eth as a slow moving coin and its fees are also kinda bit high. If you will redeposit once you lose then why can you just deposit all the amount that you are willing/afford to risk? That saves time and fees.