Sean K Reynolds falls in this category for me from watching him maul a bunch of tweens on the WotC boards.
"SEAN K REYNOLDS HUNGRY! RAAAAAAAAAAAAWR!" *crunch*scream*sqelch*splat*
Hahahahahahaha!
On-topic, I'll say that it does, with a few caveats. Monte Cook has sold more to be because he's been a stellar bloke -- I bought things I usually wouldn't. Similarly, Grim Tales has sold one less copy because one of those involved kind of grated on me. However, I've heard a lot of positive buzz on GT, so I'd probably pick it up if I ever had to run a gritty, low-magic game anyway, 'cuz it does the job.
Community interaction influences these purchases. And I'd expect that people's purchases of my own material would be based, in part, on my own community interaction. To me, it only makes sense. I'm not buying from corporations, I'm buying from people, and people I'd chill with would be more likely to get my money that folks that torque me wrong. However, the most important factor is what is good for my game. For good or ill, my game doesn't NEED a whole lot. Thus, I can give money to those who rub me wrong just because it's good (I baught something from Mongoose even though Matt Sprange refused to continue contact with me, I'll still buy an ENG product or Bastion item even thuogh they stiffed me). But when I'm looking at something interesting vs. something semi-essential....interaction affects me.
I'd expect and want to be judged by the same standards. If you think, after reading my low opinion of some book or another, that I'm an egotistical jerkwad, that's fine. I'd hope that you'd judge my gaming products based first on how useful they are at your table. And if it's just an interesting thing and I lost a purchase because I acted like a jerk, well, I'd like that to happen, too. I'd like to try and make good on it, maybe, but whatever.
I don't need to be protected from the consequences of my own actions. I'm a community member, for good or ill. I'm in this for your amusement and my own. I'm not perfect, and sometimes I make a jerk out of myself, and may be we don't always see eye-to-eye, but we're all gamers, we're all board members, we're all in this thing together, yo. And if you make something cool, I want to hear about it so that I can give you some of my paltry income for it. Even if maybe we've had a spat. We're only human, after all.