OK - it works for the *advertisers*
... but at what cost to the privacy of the targets? (ie. the users)
Unless & until they can acquire the information with an up-front positive opt-in from the targets, I shall continue to studiously ignore all advertising (and anyone thinks I can't do it - I was thrown off an advertising appraisal panel in a former company because they'd show me the 30 second "reels" and I had no recollection of any of them - my brain simply refuses to admit the information).
On the rare occasions they manage to infiltrate my defences, then I usually make a mental note that if they need to advertise it that heavily, it must be crap and I don't buy crap (willingly).