Thinks overall it vvill be good change, you vvill get more items for premium cristals, but it despend from "vvhat" items vvill you get 50%, , hope items like Incarnation Yar, Book of secrets, ark for incarnation, and another basic stuff vvill be decrested too, if only the cheap thinks vvho cost 30-50bc, it vvill be negative change
If all vvill go in good vvay, it vvill be more atractive to top up in Magic Lamp, Top-Up bonuses, Short-term Bank Deposits, the Wheel of Fortune etc events.
And ezier for nevv player to "Catch up"
Or get cheaper thinks but only to you, so economy of server vvill change only small
Good move