I have seen RWS websites being sold in Ebay many times. I don't know what is RWS. The seller said RWS software is worth thousand dollars but I could not find info about it. Do you know about RWS?

Well a quick acronym search revealed the RWS stands for "registration web service" (which I assume is domain registration). I'm not too sure if it's the proper term, perhaps someone else could back me up on that.

You should really avoid buying websites on eBay though. The majority of the "get rich quick with AdSense" sites aren't worth buying at all!