There are a number of companies like Exclusive Resorts. They're called 'destination clubs'. There is some some good info on them at
www.heliumreport.com.
In most timeshares, you actually *own* real estate. You may have paid too much, but in most cases you aren't at risk of losing 100% because the original developer has financial problems.
In destinations clubs all you have is an unsecured promise from the developer to let you use the properties. Typically, the sponsor is highly leveraged. If they run into problems, your investment will be *worthless*.
The second largest destination club after Exclusive was Tanner & Haley, previously know as Abercrombie & Kent. They filed for Chapter 11 in July and their members in aggregate lost approximately $300 million.