I know that Kakao used to increase prices around December 15th from the usual $20 for two chairs.

I have no problem paying for chairs everywhere we go...Mullet, Orient, Friars, etc. But $30 is an amount that makes me rethink. I may just eat somewhere and keep walking. Go back "home" to BSV to sit on the beach. Their loss. We spend loads on drinks and bottles of wine. Food service to chairs as well. They are shooting themselves in the foot IMO.
I highly doubt French locals are paying that fee.