When online casinos offer free sign-up bonuses, they don’t give you really big bonuses. A free spin costs about 10 cents, so a casino spends just about $2 for this welcome offer. Considering that each spin is worth 10 cents and that you need to wager the winnings multiple times, your real withdrawable winning should be just a few dollars. So, you can’t win a huge sum of money using the sign-up free spins, but still, it is a great chance to try out the games.