Uncle jarvis's beef doesn't seem to be with busse knives themselves, it's with the community at large. While he may say good things about the knives and enjoy using them he doesn't leave it at that. Inevitably he turns to bashing the company (or the knives) in a manner that is
very specifically meant to infuriate people to create discord. If he was in a place where he could try to troll for a negative response and not get one, I'm sure he'd be an active member who provided useful information. But anywhere where there is a sense of community solidarity on busse being a good company that produces good knives, he will try to create discord in it.
I try as best I can to avoid using the world troll, unless it's used in the phrase "trolling for response", because the term has become a generic derogatory label that many just disregard due to over use. But by definition it is what jarvis does. His end goal is to get as much of a negative snowball response going as possible, most likely for his own enjoyment whether recognized as such or not.
http://en.wikipedia.org/wiki/Forum_troll
Trolling is a game about identity deception, albeit one that is played without the consent of most of the players. The troll attempts to pass as a legitimate participant, sharing the group's common interests and concerns; the newsgroups members, if they are cognizant of trolls and other identity deceptions, attempt to both distinguish real from trolling postings, and upon judging a poster a troll, make the offending poster leave the group. Their success at the former depends on how well they and the troll understand identity cues; their success at the latter depends on whether the troll's enjoyment is sufficiently diminished or outweighed by the costs imposed by the group.
Trolls can be costly in several ways. A troll can disrupt the discussion on a newsgroup, disseminate bad advice, and damage the feeling of trust in the newsgroup community. Furthermore, in a group that has become sensitized to trolling where the rate of deception is high many honestly naive questions may be quickly rejected as trollings. This can be quite off-putting to the new user who upon venturing a first posting is immediately bombarded with angry accusations. Even if the accusation is unfounded, being branded a troll is quite damaging to one's online reputation.[11]
It's a form of an emotional powerplay where one person acts a specific way to evoke a specific response, thus showing that they have control over the other person. As long as they can continue to create this dynamic, the person doing the power play feels enabled and empowered by the activity, it's a dynamic in which they feel better about themselves. It's important to note that the information involved in the play isn't important, it's the emotional response and outcome. So while uncle jarvis's posts may be contradictory to what he's said previously, the reason behind them is consistent.