I don't want to block ALL ads. Only the annoying ones (mostly popup and popunder).
I am ok with being displayed ads by defaults for the sites I consult (especially the ones I like) since it is an acceptable form of micropayment (I should mention that I don't see ads no youtube since I pay for play music).
Sadly, such a selective ad blocking takes time to setup and maintain and with the extensions I always end up realizing that I have been blocking ads on one of my favorite sites for months.