Given previous incidents where renowned sites spread malware via ads (eg. bbc), accepting ads on your system is simply unacceptable from a security point of view.

I've never heard of anyone being reimbursed by a website that unwittingly infected them. Websites that take responsibility for their ads, that's different. But those are very few and very far between.

Right now, surfing without an adblocker is like going to a swinger party vowing not to use condoms. (Actually, I think your browser is already intimite with more domains upon one average visit to one average website than that...)

So: block ads. It's basic Internet hygiene.