I despise ads. They are a vector for viruses, are invasive, and be noisy or distracting from content and are generally an unwanted waste of space. Surely you could just put the at the bottom of the page, or somewhere out of the way? No-one really wants to look at them, very few people click on them because they are actually interested in the product offered, they are tantamount to useless for their ostensible task, doing little better than promoting a brand in a manner that I find cheapens it in the extreme (seriously, no matter what it is flashing and blinking and sliding around, it's always going to look like shit. I wouldn't even click on one that would offer me my own personal jet pack: it would either be a scam or con, a straight up lie, a "prize draw" for all your personal information, a virus or something along those lines. If it looked real, I would google it and look for a source, not go through some crummy ad service.)
Their only mitigating factor is the revenue they generate for websites, allowing new industries and the such-like to flourish without charging subscriptions. *insert discussion about banned subject*