it doesnt earn anything these days, maybe a few lottocoins. I dont have the time now to put any effort into the project and for the past 1 year has just been running on auto pilot, and not many people using lottocoins now, especially since craptsy stole half of the coins in existance
Whoever buys it could potentially earn the 50 BTC back in 1 month if it was marketed right and maybe different coins added, or converted to take BTC.
You can set the software to payout whatever % you like. currently its set to 99%, so on those settings, for every 100 LOT bet, the casino takes 1 LOT, and puts 99 LOT back into the payout purse.
But marketing this casino will cost more than 10 to 20 btc to be able to earn that 50 btc purchase price and earning that much within 1 month doesn't seem to be likely to happen as this casino seems to work as altcoin only casino. Good luck for your sell, but casino without earning any penny and only having casino script only doesn't make it worth that much in my view.