Everything you say is true, but at least having such a forum where one can get some support is better than not, and better than having that pseudo-support scattered across a dozen boards over the Internet. Doesn't excuse such lazy behavior, of course. Generally, if a company is providing an expensive product for which I need support, and then provides crappy support, I'll be looking for an excuse to try a competitor's product next time out. You might think that this would lead companies to upgrade their support, but it doesn't seem to.
One of the big problems is that most of that company's customers are idiots, so it's a huge money sink to constantly answer their silly questions with expensive, highly trained support people. So, if a producer is using the forum to weed out the Tier 1 "Would it work better if I plug it in?" crowd while jumping in and helping out when someone has a real problem, then I guess I don't have a problem with it. If such a forum is viewed as a replacement for support, then I'll likely be looking at competing products next time.