Limit number of houses purchased

In the past I have had some parents 'coaching' their children to purchase as many properties as possible, effectively sucking up all the lower priced ones so others are locked out of the market. I have tried manipulating the market (by dropping entry level prices), but these parents are persistent. My current rule in the class is a maximum of two properties per student to give others a chance. I was wondering if there is/could be a setting to limit this automatically to a certain number?

Sandy Haynes