I agree with what you say, but advertising (more specifically Google's Adwords) actually introduced me to a couple of interesting services/products! Was I manipulated? Definitely, because I clicked the ad, but I don't mind because I also benefited.

However, a lot of adverts are subterfuge these days and I did fall for one (to shame it, it was TrackR Bravo, which works nothing like its advertised, to make matters worse it was part of a present), so one does need to be careful.