this website is owned by Uri Fried, who owns The Timeshare Company. There are many threads on this forum regarding him and his company. I have purchased a timeshare from them on ebay, and it came with free closing. wasn't the smoothest but it came through, and I'd certainly purchase from them again if the closing was free.
About this website: a lot of their Ads on ebay will say "Plus free bonus timeshare", this site you have listed are the listings of the free timeshares they are offering.