In my bux, we only charged for water bigger than a tall. It was to cover the shortage of cups, especially TM's coming in and getting like 5 a day. I have no problem with people refilling. This is a Best practice released by starbucks corp to licensed stores that ALL Starbucks are required to follow. ESPECIALLY with Trenta cups.
Also, while i'm at it, ALL MODIFIERS (Soy, syrups, shots) Are to be charged for. If not, or properly rang in as a REWARDS PURCHASE ONLY with a REGISTERED CARD, then it MUST be charged for. It will create major shortage and just not end well for the team. (Not to mention orders won't be delivered, etc, etc.) I've only been at my corp bux for 2 weeks and I'm already tired of hearing "Well the TARGET starbucks didn't charge me for that!" I want go personally "coach" each one of them. :girl_cry2::facepalm::dash1::help:
Now however, in the case of this customer/guest in the answers article; if the bux was OUT of the tall size cold cups, they should have done a grande for no charge.