If the dev team seriously considers crystals being stacked to 99, I think this is a good time to point out it is an opportunity to artificially increase crystal supply by turning clusters into x99 crystals. This pumps more crystals into an economy that is starving for crystal supply. You also don't have to ruin things by Abyssea monsters dropping crystals which seems to be the popular solution to the crystal supply crisis by players who don't quite understand the reason why they don't already drop crystals.