Isn't the holy grail of advertising perfect targeting? Users aren't annoyed by the perceived degradation of the platform where the ads are served, ad companies

Isn't the holy grail of advertising perfect targeting? Users aren't annoyed by the perceived degradation of the platform where the ads are served, ad companies don't waste money on ads the user isn't interested in, and the clicks result in far more revenue. Pinterest is a leap in this direction. They have enormous potential and a brilliant team. I can't remember a time I've purposefully clicked an ad on Facebook/Twitter. The only problem with Pinterest is that it seems plagued by duplicate content.