domain price estimation websites are inaccurate. domain appraisal depends on many things such as the name itself, how much (and what kind) content the site contains, its ranking on search engines, and daily traffic. you can have a website with a really weird domain name, but if it has many articles, ranks high on google, and gets many page views daily (especially unique), then it can be worth a lot compared to an easier to remember domain name which gets no traffic and is hardly seen by search engines.