Given that advertising pays for a lot of the services we all use, the use of Adblock and similar programs constitutes defection in game theory terms - the more people who do it, the worse off we all are - which means even if you choose to do it yourself (I personally don't), it is against your interests to encourage other people to do it. Also, given that computing is one of very few areas of technology in which our…
Also, there are other reasons for blocking ads besides simple annoyance. They tend to be hosted by 3rd party domains that can track browsing history across sites.