I cannot purchase energy ingame at the moment for some reason. I am told that my "Card has reached its limit" and that I cannot purchase. I have cash in my Steam wallet which is used for purchasing anything on steam. and Ive only made 1 energy purchase in SK prior. So whats going on?
You have simply reached your spending limit for the 30 days prior to your last energy purchase. http://wiki.spiralknights.com/Billing_FAQ#Spending_Limit