In one sentence, describe what the following article is about:

You can figure this out by taking the cost of making the wheel and buying the prizes, the number of people who are going to play (this can be an estimate), and the probability of people winning the grand prize. People sometimes "get into a groove" and start to win prizes by the boatload. To prevent this, designate a number of times a person can spin the wheel.

Summary:
Set a cost for playing the wheel. Figure out the number of times someone can play.