From his $ 75 million winnings on his Astros bet, Mattress Mac has paid out $ 73 million to his furniture customers. The other $ 2 million is for expenses.
The promotion was you would get twice your money back if the bet paid off. Looks like that means Mattress Mac has a mark up on his furniture of more than 100%.
He has another bet going already on the Houston Cougars bb team winning the NCAA tournament. Don't know if that is a promotion or not.