Not for profit organizations and 3. The potential reasons are legion. It is the least expensive element in your portfolio of Internet services. Far less than your Internet access, mail service, Web page hosting or telephone costs. It is questionable who really owns such a Domain Name.
Service is another important feature to consider.
Before the U.S. Government broke their monopoly, it was reported that they registered over 14,000 Domains per day. They do not provide technical or account service by telephone. In short, they're just too big. Until 17 September 1999, NSI granted about 60 days credit to Registrants. However, this practice has led to serious problems, for example, registration of domains which are the same as or confusingly similar to famous or well known Trademarks.