Advertisers still pay for CPM ads based on what they're worth to the advertiser -- adding a million worthless eyeballs to the ad will work once, but the advertisers will note conversions fell and pay less for the slot in the future, for the most part. There'll probably be some lift from people who normally block ads but still might convert on an unblocked ad -- it remains to be seen if the lift will justify the engineering effort spent dodging the blockers.