I echo your point, it's a good gesture to attract gamblers to use the site as alternative/main
gambling house if they'll got more available cryptos.
Coin like TRX, XRP are some of those coins that very minimal in terms of transaction fees, adding those coins will allow occasional
gamblers to visit and deposit some spare coins to play and enjoy.
The very value of listening to suggestions most of the time gives more interest and trust to business.
Of course it can be justified that the more altcoin options with low transaction fee, the better for the site. While we currently have LTC as an option, more options are better.
You can use Binance, the fee for withdrawing LTC is only 0.001
That's right, I checked it after a few minute the post was published. That's why I say withdrawal fees will be different on other exchange or wallet.