A lot of people use Python because it was batteries included, because everything you ever wanted was already done and made for you. I work in Python on a daily basis, but I cringe regularly at the #python channel on Freenode and the kinds of people the language attracts.
Python, quite simply, attracts people who don't want to code or learn anything.
Those aren't the kinds of people who are going to learn Clojure, sadly.
Rubyists, god bless them, are a little more adventurous, for better or worse.