It is a 'common' tactic for domain purchasers.

They watch (usually automated) "expiring" domains, and then quickly grab them and place advertisements on them. The "hope" is that someone will click on a link (from the previous traffic), giving them a profit. They usually use PPC links/search engines (and not necessarily google, depends on the person doing it). If they can buy a domain for $10 or less, but "make" that money back within a year (and most do), then it is profitable. Many domains such as this will usually generated at least $100/year or more, so it is a 1000% profit for every domain you get like this.

This is not a "real" domain (i.e., a "real" company), but rather a domain with a bunch of ads on it.

Just so you know though -- if you are looking at getting into this game it is highly competitive.

Johnathan is correct. Note the link at the top where it states the domain is for sale...

How do you set these sites up? Do they remain indexed?

Domain parking is so fustrating as it just clutters the internet up with spam. If you buy a doamin do something with it and these types of sites are just so wasteful