As the value of BC rose, I propose to reduce the amount.
0.01BTC is a day's salary in certain countries. And why are you waiting for 6 confirmations if this measure is really only a spam barrier? 21:15, 22 April 2013 (GMT)
Require payment for new user creation
I believe that a payment is required on each new user creation, not just in order to gain edit powers. Currently a new spam user is created every few minutes, and the Recent Changes page has become completely spammed.