Yes that's true, but why is it nuts?
Every timeshare there is has annual dues.
Would you expect to be able to buy a house and never have any other expenses on an annual, or even monthly basis? There's taxes to pay, insurance premiums, maintenance items, lawn care, garbage pick-up, electricity, telephone, cable tv.
Your timeshare has all those regular expenses, plus others: Mousekeeping, laundry, pool maintenance, Member services, Transportation, Administration, Furniture replacements and so on.
Even with annual dues and an initial substantial outlay of funds, in just a few years you've broken even with what you would have paid in regular hotel costs, and for the rest of contract, you're way ahead of what it would cost you if you stayed in hotel rooms, with their ever increasing rates, every year.