Gambling Altcoins is better currently because of the lie transaction fees and faster confirmations but we have to be prepared to pay something extra if we want to exchange them for bitcoins and that's where a pot of people stutter.
One of the biggest costs in a normal online casino is the payment processing costs, every time a player makes a deposit using an e-wallet, bank account or credit card, theres a fee that the casino has to pay and casinos usually compensate for some of those costs through reduced odds or bonuses for their players. But with bitcoin, deposits and withdrawals are free, so payment processing costs for bitcoin casinos are non-existent.
That's true , if we are talking about gamble using bitcoin.
But when it comes to altcoin there's a lot of things must be done , such as hiring an expert on altcoin market.
And it cost quite a lot of money (more than e-money fees in fiat casino) that makes casinos reconsider to accept altcoin and choose bitcoin only.