If browser ads had a real-life equivalent, they would be more like that creep who suddenly pops in front of attractive women in the street trying to grab their phone numbers, and no matter what you do you'll never get rid of him and he'll be following you on your way back home (probably to provide you with a "better user experience").
If all web ads were limited to a static gif here or there in the corner of a web page, I don't think adblock plus would be a thing at all.