The way Timeshare Nation works is that the "seller" covers all the transfer fees, etc., and the ownership of whatever it is goes to the "buyer" at no cost. Often it includes accrued usage. Timeshare Nation only facilitates the advertising of the ownerships and many of them are sourced from postcard companies and the like where the "seller" is just trying to get rid of the ownership. Some of the companies are the ones that take "trade in" ownerships for Mexican timeshares and the like. Bottom line is that the transfer fees, recording costs, etc., do have to be paid by someone but the someone that pays those is not the "buyer."
I've picked up several WorldMark contracts and a couple of mandatory Vistana weeks through Timeshare Nation. It can be a great deal if you are an educated consumer and understand which ownerships would fit well with your usage goals. I just posted this one here because tuggers are the more educated consumers in the timeshare world and I figured someone would be able to use this contract, particularly if it has credits in it - the ones I've picked up previously were fully loaded because the folks that are trying to get rid of them this way are typically not actually using them. YMMV, of course.