The adblockers are mostly comprised of people who simply don't want to look at ads and aren't seeking to pay out of pocket, either. There is a vocal minority that speaks about privacy and (possibly a separate group) claims that they'd rather pay for content but the majority just plain doesn't want to be bothered with looking at ads. Maybe the next generation is ad blind. I doubt they're concerned with malware given what they'd download from The Pirate Bay. My guess: they just feel entitled or don't feel like their contribution (click/view-wise) impacts the publisher's bottom line. On the whole, not any more annoying than people who disable JavaScript.
