Someone who is willing to pay for a service is also an extremely desirable person to show advertisements to. You've just demonstrated you have disposable income.
I remember once watching an episode (can't remember the show) where the dialogue included characters talking about how good their new car was. The B-rolls would show almost every angle of the car too.
Sure enough, according to the end credits, the episode had product placement from the car manufacturer.
This instance it was a little _too_ obvious but I have no doubt I've been exposed to hundreds of in-film/show adverts.