I think there should be a casino in Skyblock because i hate and other people hate waiting for the lottery to be done. Plus the casino is a big and easy way to get money. There should be slot machines, scratch off tickets, And other things that a casino has you can add. On skyblock money is scarce but the casino will help that. Like a slot machine you would pay 300 currency and you could win more or less. So you put 300 currency in and if you hit the jackpot on that slot machine you get like 5,000. (The owners can decide the prices).
Personally, I think slot machines using money is a bit much. A simpler solution would be using items and a bit if redstone. There was a /warp casino at one point that was run by a staff member and could possibly be done again
To be honest, I'm working on a casino on my island. It accepts diamonds, iron, redstone, gold, and emeralds. By playing, you have a chance to win armor, tools, along with ore blocks. I also have a game that is complete, and it is a guess the block game. You guess one out of nine blocks, pay any amount of money, and if you guess correctly, you win double what you payed.