If I may ask, how many tokens do you receive for betting? Do you really pay if your players actually win a lot?
You can visit on Deposit page to see what coins are available on Bitcasino.io. Or you can see an image below:

I use BTC for deposits as the fee now is not too high. Besides that, once I deposit, I do not use all of the amounts to play at one time because I do not play too long. So when I come back to the site, I still have some balance that I can directly use to gamble

That reduces the fee of depositing and I do not have to deposit many times.