1) “Junk ads”, ads that take you someplace just to get your personal information, or make you browse through 100 webpages while offering nothing but scams and hidden “opt-ins”. My experience has been that I am most likely to encounter a “bad site” when I click on seemingly innocuous ads. Sponsored Ads are the worst offenders, usually.

2) Awareness builder ads just tick me off. The ad takes up real estate, and if you are fool enough to click on it, you get to a corpoarte site that either has no information, or is so graphics intensive it locks up your computer. 99.9% of the time these are irrelevant to me as a consumer in the first place, so they doubly aggrevate. Triple that aggrevation if they are flashing, animated, or low in or out of their space, obscuring or distracting my content. it actually creates a negative impression for me of the company/product in question. Forced viewing of the ads, such as before, or on top of the content I want will often give me a mental note to not visit that site, and find the same content elsewhere.

3) 99% of the time, I am NOT shopping on the net. Ads for ways to spend more money I don’t have. Ads trying to get me to do something I’m not out to do rankle me too.

4) Irrelevance of the ad to me. 99% of the ads I’ve encountered in 10 years of surfing have not been anything interesting as far as a product or service.
I’d rather see ads for places and services I know, like and trust over and over than for someone shotgunning me with junk.

So, until you can find a way for ME to customize my ad experience very specifically, it won’t matter how *much* junk you can put out on the net, it will still all be junk, unusued by me, money wasted by advertisers on Yahoo. Congrats on your ability to put more crap ads on the net, but until you can show me the ads I want, it’s all just more crap.