I can see your point in wanting to discourage people using 'bait nodes' with the obvious and just trying to garner XP from it, but I'm not sure your proposed solution is ideal.

I've just made a post, I personally considered it obvious but by the way the question was asked I don't think the person asking had thought it. I also read through the other posts on the topic checking no one had raised this particular potential red flag, none had so I did.

Did I do it to garner XP? No. I am a Monk myself, and am very close to moving to Friar, but I try to post what I think needs to be said not what I think I'll get upvoted on. If I was bothered about XP though and your system was in place I wouldn't have posted it, the person asking may not have realised this 'obvious' thing and bad things would have happened.

Often the nodes which are 'common sense obvious' will get are quite fairly overlooked, and won't get upvoted, but I'm still going to post them since I want the person to know this, and I'm as 'proud' of posting them as I am of any of the more conversation nodes I post which tend to get voted higher.

I'm now over fifty nodes posted, all replies to questions. I've not yet posted a question or meditation because I've not had anything I've felt warranted other people's time. I am actually now working on a SoPW question, but this is to get answers leading to knowledge, not to get XP.

To have a community we need people who post what they think, not only what others want to hear. In my opinion trying to enforce that equation you mentioned would work the opposite way, people may well post the greatest breakthrough replies we see but we'd rapidly lose their 'slight correction' replies. We'd lose posts which post out the simple and obvious on the grounds that people often still manage to overlook it.

The XP system is possibly broken, I really don't know as it seems to work okay as far as I can see. What you suggest strikes me as just as broken though. 'Punishing' the people who post the great posts because they also post small replies which don't attract XP is not going to help matters.