is blogging a sales pitch?

Anyone notice this? Probably Poker blogs have a certain amount of advertisement in them by the nature of the game. I really wonder if anyone who runs a blog ever made a dime out of all the advertisments they offer. This blog hasn't, but actually it has not been the intention to do so, which is pretty unintentional. I would like to earn a few extra bucks here and there, so what's the matter, how do all those Poker bloggers who earn cash with it do that? I mean besides winning at Poker. Anyone got a clue?