yes, you can do the ebay thing and even craigslist w/ some degree of success when renting or selling a timeshare and yes you may expect some pitfalls; that's how it goes with these types of marketplaces.

i think craigslist is hit or miss.

ebay has advanced listing fees plus ebay commission and paypals cut, so if you are trying to avoid any type of fee this combined with the problems expressed in this thread, ebay may not be for you.

these sites also require a bit of savvy when constructing an ad, making it seem alluring, etc. and remember you will have to do everything yourself; deal with emails, phone calls, answering questions about the timeshare, negotiations, and closing too. perhaps this is something you wouldn't mind doing, buy maybe not ? ? ?