We have a Marriott Vacation Club membership. The sales meetings are a pain, but we've learned how to endure them over the years. Just stick to your budget. They'll keep bring other offers, one time weekend deals and such, it's just a matter of saying no unless you find something you really enjoy.
I'm not sure it's much cheaper than a motel for vacation but a one or two bedroom apt for several days is a significant upgrade especially if you use it off season. Hilton Head Nov-February is a great getaway. We've also done Spring Training in AZ that way as well as Park City, Ledson, UK (Hadrian's Wall), Paris and next week Vegas with a helicopter trip to the Grand Canyon.
I haven't done the math, but I figure it's about the cost of buying an RV, without the upkeep and noisy neighbors right next to you
They also check for ID