I run an adblocker to protect myself from "the latest steroid taking GNC by storm" and "This website sells apple products for cheap!". Its an eyesore and ruins my user experience.
This is fine as those are clearly scams designed to separate you from your money. But on the flip side you're missing out on the new skin treatment that a stay at home mother found that takes 20 years of your face (doctors HATE her). Hint: It's acai berry.