Why has Search not got Better??

According to Dave Winer it is because of a thing called "strategy tax" (I think it could also be called cannibalism).

Basically Google gets most of its revenue from people clicking on ads. They are more likely to click on ads if the organic results do not provide what they are looking for. This means that better results equals less revenue!

This tactic will only work until another search engine provides better results, and becomes popular. It makes one wonder if Google has worked out how to provide significantly better results, but is sitting on them...