You will make money from your bonus bet by choosing a winning selection. Most free bets will require a qualifying bet to release your free bet. So really you need to make a profit from that initial qualifying stake and your free bet combined. For example, if you place a qualifying bet of €10 to receive a free bet of €10, you have risked €10 of your own money. You now need to return more than €10 from your two bets to make money. Remember the free bet stake is not normally returned.