Harke the Boeotarch
Dreams Wash Away
Chances are that, with the flood of advertisements you see every day, some are bound to 'click'. It's just like telemarketers and spam Emails. What they're selling is bound to click with someone. Those are the odds that make the expense and effort worth while.
This is also the explanation I find most likely. I get many advertisements for stuff I'm completely uninterested in (local supermarket chains, Grammarly, furniture from DIY stores, cars -don't drive). It's rare I even get custom ads these days.

