In both a negative and postive sense, definitely. However, there are at least two different ways they'll affect me negatively (and possibly more positively).
There is the jerk online. These people just cross the lines of social propriety so much, that I have no desire to see any of my money heading in their direction, directly or indirectly. These people I avoid and try to avoid their stuff. If they have a great product, and I hear about it and love the concept, I might buy it, but it would have a high threshold to meet.
However, more important is the person who not only can be a jerk online, but by doing so also give me reasons to not to want their products. In this case, FFE was the perfect example (although, admittedly, it wasn't their messageboard behavior).
I honestly believe that FFE had a lot of products that were great ideas. If executed better, they could have been top products. The first product I bought was highly disappointing. I then heard a couple of products were pretty good, and considered trying them at some time. Then Jim Ward posted a rant that basically said that people who attacked the products for having bad rules had their priorities messed up. That pretty much meant that I would only pick up their products at bargain basement prices or less (I'll pick up anything that might have some value for the right, cheap, price).
The rant didn't just showed he had no respect for other points of view about a quality gaming product. It also showed he didn't respect a priority I had in gaming products. I certainly wasn't going to even consider a product his company produced when he said that something I think is important he didn't feel was something to work towards in a quality product.