The reason why some of these bargain deals are being given away is usually because they no longer suit the owners' travel needs, desires, and lifestyle or because they can no longer afford the maintenance fees. If you feel that these giveaways will suit your travel needs and you can afford the fees, then it might be a good deal for you.
As for the Four Seasons in CA, I think that $7000 is a bit high. If you really want it, you might be able to negotiate with the owner a lower price. How many timeshare resale websites have you checked out? You might be able to find a similar unit for less than $7000.
Also, check out E-Bay and the completed listings for Four Seasons CA. That will tell you what others have paid for a similar unit.
Lance C.