Those "what's your website worth?" sites are humbug and are based on arbitrary criteria.
Let's run NS through five randomly chosen sites:
http://www.yourwebsitevalue.com/ gives NS a value of: $158,223
http://www.evaluateanywebsite.com/ gives NS a value of: $14,384
http://www.checkwebsiteprice.com/ gives NS a value of: $49,633
http://www.siteprice.org/ gives NS a value of: $164,549
http://www.mywebsiteworth.com/ gives NS a value of $20,857