Sometimes I just want to play for $10 ~ $20 and that's not possible with BTC or ETH because of tx fees and minimum withdrawal from exchanges.
It is possible with Bitcoin if the casino has Lightning network technology support. But yeah, duelbits do not have it yet.
If both casinos and exchanges support LN then I will use it, no problem, as long as the fees are negligible. Some people just want to play without getting exposed to volatility risk, you know, get in and out of the market asap.
IMO, add lightning newtork or more altcoin won't really attract people to play, it also make duelbits team have much work to do. Duelbits already give away free coupon often through twitter and sometimes on this forum, so i think that's enough to new people whom want to test duelbits.
It's not mutually exclusive, adding more payment support + more promotions = users happy