What is a 50x wagering requirement? A 50X wagering requirement means you must wager the amount of your bonus 50X over in order for you to collect the bonus and subsequent winnings.
Interesting question- slot machines are actually based on a degree of randomness in each individual play, but the payouts when those random events produce a winning combination are controlled to ensure that only a certain percentage of money played is paid back. Typically in the high 90% range.