I wouldn't, actually. I've got comparable karma (221) after about two years, and I can't even consistently downvote items. I noticed down arrows a while ago for comments, but recently I've noticed that they only appear on certain comments, and others are upvote only. My assumption has been that there is some sort of inflation at play.
Not that I'm complaining of course. I think I've only used my downvote powers once normally. The only other time I've used such powers was when I noticed some spam comments, and chose instead to flag them on the noobcomments list.
I honestly think that something like my level of karma is too high a limit for posting things like an RMS. This place isn't reddit, so I take my comments on here a lot more seriously. As such, I don't comment nearly as often since I don't usually feel I have a comment of sufficient intelligence to contribute.
Really, I'm quite amazed anytime I see my karma increase here. I have a definite inferiority complex when reading some of the great comments here.
With experience like that, building any measure of karma could be a slow and arduous process for the typical new user. Unfortunately, I'd imagine a lot of people working on their first project would have the same sort of inferiority complex, yet they would be exactly the sort to benefit the most from an RMS sort of post.
In fact, I'm building (very slowly, thanks to inexperience and a bit of RSI) my first "major" project, and I had hoped to show it off here first, but now that same "I'm not worthy" feeling is making me feel like it wouldn't be welcome.