Earlier today I was looking at the Whois entry for a competitor's site. The "Registrant type" is given as "UK individual" and the "Registrant's address" says:
"The registrant is a non-trading individual who has opted to have their
address omitted from the WHOIS service."
Now this is clearly incorrect because this is a real estate website.
The same competitor has another site which is very similar in appearance which does have the correct Whois information.
That they are run by the same company is apparent because the company name is used on both sites. The second site has a number of one way links pointing to the first.

Is there any significance to this? I mean is there a possible advantage in registering the first site as being non-trading then setting up links to it from the second?