This is the thing. The economy of the web, in the sense of who is paying for all those 'free' sites, is built upon advertising. Personally, I don't like that very much, and in particular I dislike advertising in general.
This does not change the fact that advertisers are paying for those sites so that you can view them for 'free'. Thus blocking advertising is not an ethical act by a well-known test for ethics (what would happen if everyone did it?).
So - don't install adblock, and if you hate advertising that much, don't visit sites that employ them to pay their bills. This will result in a fairly restricted web browsing experience - but perhaps the time saved can to do something more productive instead? For myself, I just deal with the ads. And sometimes, despite myself, when they seem to be advertising something that I might be interested in, I even click on them. Once, and no-one is more surprised at this than me, I even bought something.