Someone who can gamble 1 bitcoin could definitely do so if they want to and pay whatever the fee there is, but for people who rather gamble with 20-50 or even 100 bucks, playing with tron is much better both because low fee but also because it is huge numbers. Doge literally got a place in the gambling world thanks to that, it is always fun to put up 5000 of something to gamble instead of 0.000005 of something, that doesn't really feel cool, but putting up 5000 of it feels cooler even though they are both the same amount of money.
No, you won't feel that "being cooler" effect since all deposited cryptocurrency is converted into Duelbit's coins which is equal to 1 USD. So your bankroll will appear the same no matter what cryptocurrency you deposit but I agree that implementing Tron as one of the cryptocurrencies accepted on the site is a good thing since it is way cheaper than ETH and BTC, would have suggested XRP if only they are on the clear with US SEC.