Thing #14 Technorati and How Tags Work

I search School Library 2.0 in Technorati by tags and by a general blog search. Under the tag search I found 28 hits with most going to 23thing posts but under the exact phrase blog search I came up with 120 hits. I still had a hard time searching and understanding this website. Right now I don't see it as something I will use. Tagging I understand as it is a great way for the individual to sort information. I can also see how it is something that the search engines are starting to use. But how much of it is going to money driven as in companies purchasing tags so their name shows up the most? Does that defeat the purpose of pure tags by people who are truly interested in a same thing?