There is an ongoing business trend in It industry which covers the resale of domain names called domain after market. It includes the natural or organic traffic, branding and resale value opportunities. In the last decade, generic domain names have sprung up from certain names in business, gamb-ling, po-rn and other commercially lucrative fields of the industries worldwide.
The TLD indicates the type of organization like .com for commercial etc. is often not followed cause their are no regulating body for registering domain names.
Link: The nine.org Domain Is Not For Sale
