No matter how much human capital was invested in making targeted ads possible, only very rarely I
There is the issue. "I." You may be one in 100,000. Also there is a trickle-down effect. A brand will spend enough dollars to attract a certain number of fans, then those fans attract others organically. Many will say you "Ads do not work on me," but unless you know exactly why you choose product X or Y, it is difficult to say with confidence.