I second this suggestion, hopefully roobet add more altcoins with cheaper tx fee as soon as possible.
It helps small players like me to minimize transaction fee for deposit, as it will be not worth enough to deposit few bucks in btc/eth when the tx fee is too expensive.
It will also bring more players on roobet obviously, so I think there is no reasons for roobet not to add more altcoins
From the above mentioned altcoins, I choose XRP and TRON although my favorite altcoin to gamble is DOGE.
Most of later born altcoins have fast transaction speed and transaction fees often are cheaper because of cheap price for each coin. XRP and TRON have faster transaction speed than Dogecoin but Dogecoin serves its role so good on casinos. Gambling with small amount, use it for withdrawals and deposits is good as well.It helps small players like me to minimize transaction fee for deposit, as it will be not worth enough to deposit few bucks in btc/eth when the tx fee is too expensive.
It will also bring more players on roobet obviously, so I think there is no reasons for roobet not to add more altcoins
From the above mentioned altcoins, I choose XRP and TRON although my favorite altcoin to gamble is DOGE.
TRON is a rising star on casinos since late of 2019, after the Justin Sun's releasing news on scheduled lunch with W. Buffet. Sometime an altcoin needs to have its landmark to be widely adopted.
BCH is now something some places use, I personally dislike that coin but that is my individual opinion, coins like eos, tron, wave all could be used because they are very cheap to transfer money, plus you can simply just take a look at the market cap of coins, see which ones are easy to implement and just add as much as you want. I would say USDT is one of the up and coming currencies in the gambling market as well.
It would really be good to look at if we do able to see XRP,EOS,LTC and DOGE into the site which would surely bring of more users if they do able to see that
there are lots of coin options for them to deposit on.
Personally, i do like DOGE yet its cheap and also theres no problem when it comes to fees or confirmation times.
( Refer to my post one page before this one to check on the responses of their support )
. So I'd expect you will get alot less if you win on the site compared with if you lose on it 
. But, I do not think you need to spend tens of millions of dollars into a casino to make it like this. You just spike up the house edge and instead of making 1 million dollar revenue and 500 thousand cost for a 500 thousand profit, you end up with 5 million in revenue and 4 million in cost for a million in profit.