If you are clever you can hedge your bets and whatever the outcome withdraw most of the free bet. You can’t withdraw the free bet, but you can keep any winnings from it. Most online gambling sites offer promotions such as free bets to try and get you to sign up with them rather than their competitors. It is where I started and over the years has made me a lot of money. Matched betting is the easiest way to become a professional gambler. In short: Keep as much money as possible from free bets. 8 So You Still Want To Be A Professional Gambler?.