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There was a suggestion somewhere in the text to bring back scrolls into the game and allow a student to cast them without losing mana and at the student's current level. With the scroll being consumed in the process. This would immediately make the student skill equivalent to that of a Priest.
Plus, there would be less gold involved, and the pace would be slower, which would benefit both mages and the Tavern.
A guild from the start seems excessive and ideologically incorrect, in my opinion.