They are engaged in a business that generates profits from the sale of placed advertising and merchandise. Both legitimate ways to make money.
I once owned a web site with "Ron Paul" as part of the name, but I abandoned it. I just checked today and noticed it was up for sale for almost $2,000. Guess I should've kept it.
Also, before one more uninformed person mouths off, read this:
Domain Name: RONPAUL.COM
Registrar: FABULOUS.COM PTY LTD.
Whois Server: whois.fabulous.com
Referral URL: http://www.fabulous.com
Name Server: MYNS1.FABULOUS.COM
Name Server: MYNS2.FABULOUS.COM
Updated Date: 10-feb-2013
Creation Date: 22-nov-2000
Expiration Date: 22-nov-2020