How about the consumer specifying what they're interested in hearing about as far as products and services go, and then serve up relevant ads? For example, I am interested in homebrewing, getting a good price on an Intel i5-2500k, an SSD, a blu-ray player, Gillette Fusion blades, an oil filter for my lawnmower, and Gatorade. Besides those products, ALL ADS WILL ANNOY ME AND BE SUBJECT TO MY WRATH.
I'll tell you what I'm interested it, not the other way around.