Provide aid... for a price

You are a learned and powerful wizard who has devoted years to delving into the depths of the nature of magic. Your reputation for mystical knowledge and spellcaster power is unmatched throughout the seven kingdoms. Unfortunately, this means that people keep interrupting your work to ask for help with their problems. Most of the time you send them away, but the latest audience to arrive is interesting... and if you just help without charge, this will just encourage further, less worthy, supplicants in the future.