I would say due to it's pronnounciation and use, it has a value of at least $1,000. However, due to the "s" I think it may decrease it's value or not, depending on how confident the end-buyer is. Check for trademarks, as that is really important and if a trademark is there, your domain is pretty much worthless. Could be used as a 'screenshot' site, and many other things related to the 'human eye'.