Wow, talk about an oldie but a goodie...it sure is interesting to see this thread again.
For the most part, the attitudes of writers and company spokesmen have influenced my opinions on buying products in a positive way. If I see something from one of my favorite authors I'll likely give it a chance and pick it up, as long as it's reasonably priced.
Still, there have been some exceptions, which went the other way. Without naming any names, a few years ago there was a discussion on the question "does editing influence the purchase of a product and should it be a primary concern for a publisher." This was, as they say, on another board

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So I said that yes, it does matter, and yes, a company should pay attention to it, because if you get a bad enough reputation for these things, your sales will slump. Well the company reps from two different companies jumped in and not only did they disagree with me, they played the "you don't know anything about the industry if you think that's the case." It also happened that I thought a lot of their products were sub par in terms of editing, so I decided to not buy anything from them again.
Now if you flash forward, both comanies are no longer in business, and a part of their problems (not the only part to be sure, but a pretty big part) was that they developed a reputation for creating poorly edited products but also not caring about the finished product.
So I guess if you say enough things that bug people, you get a rep for it. Does it tick people off and lose you sales? Certainly. Does it gain you anything? I really don't know. I can't imagine why it would. I guess I've always thought that when I'm dealing as a representative of my company (which almost never happens, but has on one occasion) I think that "he who speaks the least, speaks the best." Or something like that.
--Steve