I read all kinds of things that I wouldn't want to fund. I read things that I would pay to get unpublished. I've spent hours reading Stormfront and Breitbart. I've even read Tom Friedman, god help me.
You don't listen to anybody you wouldn't pay? I listen to people I would pay to have behind bars.
The same reason browser exploits are valuable: I cannot scrutinize every site I will visit in a second. Links pop up here, on Twitter, on IRC... It requires constant attention which is something computers are much better at than humans.
Also, I don't mind reading Bezos' blog. He doesn't need a tip jar though.
Reading it implies it has some value.