Aside from that, I think playing games on decentralized casino is more expensive because every bet is transacted via blockchain so we need to pay for transaction fee every time we made a bet and honestly that kind of process is very impractical especially if we are doing thousands of bet every session.
In my opinion, it is way cheaper and more fun playing in centralized online casino than playing on the decentralized one.
Centralized or decentralized, if it is a blockchain-based casino, games must be provably fair that you won't have with non-blockchain-based casinos.
On-chain transaction fees are always one of painful experience for blockchain users including gamblers. It is similar to Play-to-Earn games on expensive chains like Etheruem ERC-20 chain and maybe Binance Smart Chain some weeks when BNB hit $500 to $550.
A minor tip is you can observe distribution of transaction fee on each chain and see within what hours, transaction fee will be usually cheaper than other hours. Weekends will have less activities on chains so on weekends, you can have cheaper transaction fee than on other days.