Calling all Timeshare experts - are there regulations on the resort on how many ownerships they can sell?

I understand that Timeshare divides a year of ownership into 52 weeks, and one can buy number of weeks instead of the whole year of ownership for their vacation needs. For any given unit in a resort, a maximum of 52 Timeshare owners can use it during the year. So are there regulations on the resort on how many ownerships they can sell? For each unit, if they sell more than 52, then they are selling “Properties” that do NOT exist, like overbooking a flight.