Already own domain names but have no website?
Many people have domain names they own. Why not have professional looking holding page rather than nothing. Having an existing web page is a good way to build up a history on a domain name rather than having nothing found.
This is important for future search placement.
Having a landing page can also mean you can start using (PPC) pay per click advertising to get people to that page and make a sale. UFO can advise on Google Adwords an affordable way to get traffic to your site in a competitive market.