Getting some of your info tracked is not all bad. I could see where it leaves technical specs of your computer and begins to geolocate you without your permission or cross-reference you with social networks etc... Buut, at the same time none of us likes to see advertisements that flash telling you to punch a monkey after taking some Viagra. In an ideal world, you would see LESS advertisements if advertisement blockers didn't exist, and you would see more relevant ads that would benefit you from clicking it by having your information tracked. However, this is in an ideal world and it just doesn't work in this world.
Personally, I have ABP installed and if it's a website I support ie: Slashdot, I'll disable ABP. I may not click on the ads but just viewing them somehow gives back a little bit.