The intention of this section is giving a generic appraisal for every domain, but it doesn't mean there aren't idiots..ehm..pardon...people willing to pay for crappy domain names. Just look at Sedo auctions everyday, for example, or Sedo sales in the home page.
Said that, i think photowatch.net worth reg fee. If you develop a little bit (not a minisite BUT something better) the value could increase, otherwise your max. would be a 2x ROI.