They don't fit our needs anymore. We come to recognize that it is time for someone else to enjoy the property. Developers do it all the time. We have met some individual's that did it. However, we advise that people don't think of their timeshare as an money investment.
Interval ownership is more about saving money and investing in a vacation future.
Optimally, you are buying ownership in a place that you want to stay, or will allow you to exchange for places that you want to stay. When you decide that it is time to change your lifestyle, people that purchase resales usually make out better. Look for a property that meets your needs. Even if you don't plan to exchange, select a property that accommodates it well. Some belong to both.