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How?  Geeeesh.
It's a CO-OP.   Think Union.  Those are likely the rules of the game.  Sell there, play by the rules.  Would've been better to know that going in, and in writing, but hey.  13% commission too!.  Nice.  If you wanna play over that field, ya gotta use their ball, I guess.  Frankly, if it works and you're happy with your take, continue.  If you don't like it, sell them somewhere else.
While not the same, we have towns and villages around us who charge exorbitant prices to rent stalls at their "farmers markets".  I don't know of how many of us farmers can pay their prices.  It's a shame it has come to this in far too many places.