When online casinos first came into the scene they had to think on a marketing idea that would attract more players. Online gambling was new and many players were unsure if they should deposit funds in what seemed like an unknown entity. The marketing ploy that most online casinos chose and is still being aggressively used today is the cash bonus sa gaming.
Naturally, as more and more casinos started offering cash bonuses a different kind of client emerged. A client whose sole interest was in the bonus itself and his goal was to cash out the bonus as soon as possible and than simply leave. This led up to the online casinos toughening their wagering requirements before allowing a withdrawal of the bonus.
The wagering requirement is a total amount you have the bet in order to be able to withdraw the bonus. The actual number varies from casino to casino but a typical number could be between 10x – 20x the amount of the bonus, so if you deposit 500$ and receive 500$ as a cash bonus your total betting must be above 5000$ to cash out the bonus. This may seem like a big amount but remember that if you are playing a game like blackjack using 5$ bets, you will win many hands (as well as losing) so the requirements can usually be cleared in matter of several hours.
Some casinos have blocked several games from qualifying as a method to clear bonuses. This usually includes the bets games that casino offers like a very liberal version of blackjack (for example a very small house edge single deck game) or some forms of video poker.
Online poker sites also offer sign up bonuses. The method to clear those bonuses is a little easier since you have to play a certain number of raked hands. Online poker bonuses are easy to clear even if you are a mediocre player and most online poker sites of periodical reload bonuses which allow poker players to enjoy other bonuses than the regular welcome bonus.