How this works. A price is what the room thinks the chance is — 34¢ means 34%. One share pays one coin if it comes in and nothing if it does not, so backing something at 34¢ turns 34,000 coins into 100,000 if you are right. Every bet moves the price, and a big one moves it while you are buying, so you get a worse average than the number on the button — that is real, it is not a fee. You can sell any time before it settles and take whatever the line is then. The house keeps 4¢ on the dollar when you buy, and nothing when you sell. Nothing pays more than 200×, which is what the bank will settle.