Is there any reward or benefits on gaining rank in the fighters guild?
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Once you obtain Master rank you get a monthly salary which is deposited in the Guild Master's Chest which is directly behind the desk on the top floor of the Chorrol Fighters Guild.
UESPWiki I haven't gone that far yet myself. There are rewards or benefits on gaining rank in the mage's guild and the dark Brotherhood that I have seen myself.
The question is not, Can they reason? nor, Can they talk? but, Can they suffer? ~Jeremy Bentham