A splog is A Sign

In the artical "the article Spam + Blogs = Trouble", the author brings the problem but not offering any way to solve the problem. As one of his subtitle says, Splogs are annoying, but not illegal. To me, anything exist must has its season to exist.
A splog is a sign. Let's forget about how they make money first. If 1,000 people clicked on a same splog, can I say it must have something in common among these people? Why this particular splog talks to them but not others? In some points, all people are connected, but some are more connected than others. Splogger used this to creat their business.
To a reader, is a splog on net different with an ad on TV, when we watch a movie thru a television program?