yet my point is that no casino offers 100 percent payout
Isn't it?
That there is no casino or gambling site that gives 100% payout is true because they are business institutional and one of the goals of making it is to get profit and profits are obtained from taking a certain percentage of each player's bet. But why can gamblers still lose all their balances because they can never know when to stop and be patient to start gambling again and greed is one of the reasons players end up with nothing.
Just like other businesses or like a shopping mall. There is no how you will tell.me that you beat the shopping mall after shopping. Even if you are given a loyalty card which you shop with, there is no discount. They are simply reducing the price of some products and increasing some and give you at what seems to be a cheap price, which is not in a real sense.
So, we all lose on a long run and the business owner takes the profit while we take satisfaction which could be fun for gamblers.