The rules, in full. A price is a chance: 34¢ means the room thinks 34%. One share pays one coin if it comes in, nothing if it does not, so 34,000 at 34¢ becomes 100,000 if you are right. Every bet moves the line — a big one moves it while you are still buying, so you get a worse average than the price on the button. That is not a fee, it is the market. Sell whenever you like before it settles. The house keeps 4¢ on the dollar on a buy and nothing on a sell, minimum 100, and nothing pays more than 200× because that is what the bank will settle.