Arrington will never say that for most of his content is pay-per-post. Like a giant billlboard, you pay Arrington for what you want the tech world to see.
And he receives a lot, and I mean lots and lots of money from microsoft, facebook and twitter.
I doubt you'll find anything that obvious, not that Arrington is some sort of paragon of virtue; but my impression is that he's smart enough not to do dumb things like that; and that his main motivation has more to do with being a kingmaker than making money off of his blog.
And you know this how? (I'm not suggesting that you don't. I'm asking how you verified this information.)
However, I don't see it as a conflict of interest. He bases MS and twitter as much as anyone.
Funny that people like you call Mike Arrington a troll.
What about all of the posts he did last year when the service kept going down? Do you think all of that negativity was paid for by Twitter too?