Nice crypto domain name.
I made some searches about related domain name in the same field:
rippledice.com 4 744 $ (USD)
bitcasinos.com 4 600 $ (USD)
cryptocoincasino.com 4 000 $ (USD)
bitcasino.com 22 270 $ (USD)
btcasino.com 2 195 $ (USD)
ethcasino.com 2,025 USD (2019-09-01)
bitcoinscasino.com 716 USD
monerocasino.com 104 USD (2017-09-27)
iotcasino.com 122 USD (2017-11-06)
bitcoinscasino.com 1,000 USD (2018-06-18)
bitcoinscasino.com 716 USD (2019-06-18)
libracasino.com 667 USD (2019-05-10)
eoscasino.com 267 USD (2019-06-27)
My own estimation will be between: 500-1000$
It can be compared to ETHEREUM by market cap, but not in the decentralization side ... so the value of your domain will decrease in that point... ETHCASINO will be about 3 times more expensive than XRPCASINO ... even if we compare the transaction volume and adoption, ETH is far more better.
Of course there is a lot of other informations to take in count and comparaisons with (Monero, EOS, LIBRA etc ...)
This is my own appraisal, waiting to see other opinions...