Please don't compare double posting to quoting pyramids.
Why not? They're parallel, as far as I see it. Both are an aesthetic annoyance, one of which has been fixed by edits from moderators, and one which you suggest remove? It doesn't make sense.
As I have said before, even one use of pyramids is too much because it is enough of an eyesore to throw whatever convenience that it might have to offer out the window.
So, one person using it once nullifies the dozens of people that it helps? If people abuse it, edit it out. If one person abuses it enough, then it's the same as if they were spamming or double-posting a lot - they can be warned. I don't see how this is any different, or could even be considered different.