.... and this view might be hugely unfashionable, but I know I'm going to be marketed at, anyhow. I don't mind it being directed. Although most of the time it's laughable like advertising to me what I've just bought, once in a while it is useful.
On a slightly related note, recently I was about to buy an item, c. £400, from a dealer who obviously buys in to the advertising online as it kept popping up (from them) served up by one of the ad firms. As I was going to buy it anyhow, I thought, why not click on an ad from a site I visit frequently? Answer - when arriving at the site from the ad, prices were up by 5%.