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If I need computer repair services, then looking through advertisements for shops that can offer that service is not a detriment to me, or a distraction.I don't really understand the part about "looking through advertisements". If you're actually doing a web search, what you're looking at is a list of web search results, not ads. Any ad that is inserted in that list is there by virtue of that shop having paid for that privilege, which does not necessarily mean it's relevant; it just means that its ranking got artificially boosted.
On the other hand, if you're not looking at a web search, then you're probably doing some other kind of research on computer repair services, such as looking at reviews, blog posts and such. In that context, ads are being displayed based on the context of what you're viewing, as determined by a computer algorithm, but you're already actively looking for human recommendations, so ads won't benefit you either.
The way I see it, ads fall into two categories: 1) artificially boosting the search engine rankings and 2) do-you-want-fries-with-that offers based on what you're currently doing. Most of the time, that doesn't seem to add any special value to the consumers.
The only situation I can think of that might be helpful is when you're not already looking for a solution to some problem and an ad suggests something you didn't even know existed. For example, you're looking at cooking recipes and an ad shows up for a kitchen gadget that would really help you cut down the preparation time in half. Even then, the rational choice would not be do go buy that particular gadget, but to do some research on gadgets of that type in general and choose the best one.
All in all, I agree with GP: ads are neither information, nor decoration, but an obstruction.