For those worried about the rating system and such, I don't think you have much to worry about.
I have deliberately posted pretty "anti-labor" sentiments in one thread which was even named for me, and posted a blatently inflammatory article about Islam in another thread. I got a "negative" because one guy didn't like the article, got a couple of "positives" from the labor thread - but the point is that all in all people generally are fair-minded here and will not "Zap" you just because they disagree with what you say - which I believe was the intent - not to force agreement but to glorify, or criticize, poor posting behavior (rudeness/meanness, etc). I couldn't have taken two more unpopular stances here and there was no retribution - meaning that JC is pretty fair minded.
Since I'm pretty sure that I'm one of the people that you're addressing, I'll try to more clearly state my reason for being against this system.
Based off of what Kristie wrote, I think that she (and Doug, too, probably) wants the reputation system to be a way for other users to be able to identify the more knowledgeable and valuable users because they would probably be the most helpful. According to this, the higher ratings would correlate to more "strength and value."
Let's use one aspect of the reputation system as an example for this aviation Web site:
Here is a small sample of some of the most knowledgeable and valuable members on JetCareers: My Flight Surgeon (Senior Aviation Medical Examiner), seagull (FedEx MD-11 Captain), CaptBill (Captain at a Legacy), staplegun (Delta Air Lines Captain with over 15,000 flight hours), DE727UPS (UPS 767 Captain), MDPilot (Delta Air Lines and retired military pilot with over 15,000 flight hours), and fo4ever (Delta Air Lines Pilot).
With the aforementioned users in mind, you'll notice that they are all "unrated" (fo4ever is even "trending negative"), while you, a two-hundred-hour private pilot, are "rated positive" with two bars. fo4ever is a pilot at one of the largest airlines in the world, yet he has a significantly lower rating than you do. I'm not saying that you're not a knowledgeable or valuable member, but this is an aviation Web site, and he is an airline pilot, and you are a private pilot.
Based off of this, when it comes to flying (a big topic on an aviation Web site), I'll say that there is a very small chance that a private pilot is more knowledgeable than an airline pilot, yet the ratings would indicate otherwise (as per their intent).
This is just one example of why I think that the intended purpose of the reputation system will not work on this site. As you've previously mentioned in this thread, the ratings are "for fun." If that's the case, then so be it. If users are looking for what Kristie intended, then I think that they will be disappointed.
It is, however, important to keep in mind that Kristie never specified what the users should be knowledgeable in. It can be assumed that it must be something related to aviation, given that this is an aviation Web site. I'm just trying to picture what a new user would be thinking when they show up and see all of the green bars under someone's user name. In the end, you're probably right; it's just a popularity contest....