Not ridiculous at all. Ads for (for example) heart pills are on TV now, placed at great cost, but currently blaring to an audience of mostly disinterested targe

Not ridiculous at all. Ads for (for example) heart pills are on TV now, placed at great cost, but currently blaring to an audience of mostly disinterested targets. Imagine being able to cheaply target the subset of those people who are not just part of a certain demographic, but who actually (for example) saw a cardiologist or went to the ER on a heart-attack scare in the last 12 months.