Yes and it is a real loss for the advertisers too because I do click on ads that I find relevant and I don't mind spending money online (when it is worth the price, which it frequently isn't, sadly).

So why do it? Googles search is (or rather was) good enough to find what I want and I would rather not pay more to buy through ads.

In addition there is the issue with annoying/flash ads, though that isn't much an issue any more because I block flash with a separate plugin.