I have a hard time believing Disney is paying people to calculate costs concerning soft drinks.
And, I think we are overblowing this, as well.
I look at it like this. You think Disney believe they are losing money on refillable mugs? Think about this. A Disney quick service burger combo is 8 bucks. Now, in this 8 bucks, you are getting a burger that costs, to Disney, probably 75 cents, and fries that amount to 25 cents, a bun worth 25 cents. So, for 1.50, you are paying 8 or 8.50. Rest assured, Disney is not taking any financial hits in ANY product it markets and sells. That place is a money making machine. And, I see nothing wrong with that.
Don't worry about your drinks folks. Nothing is going to change.
Have you ever noticed how small the drink chamber is in the refillable mugs? It is, probably, a 6 ounce reservoir. Imagine how many times you have to fill that up to equal 12 bucks. Think about this, a 2 liter, at our cost, is a dollar 50, in that you have, roughly, 68 ounces of soft drink. Now, if you don't even take into account the space the ice takes up, it would take 11 fill ups to equal a 2 liter, which costs us 1.50. That same 2 liter costs Disney, maybe 50 cents because of the volume they purchase at. So, you would have to, in a 6 day trip, fill your cup 264 times, each, to equal 12 dollars. How many of you fill that cup up 264 times in a trip? How many of you, even the ones who have returned with a cup from a previous trip, filled it up 264 times, at all? And, if you did, you still paid a 700% mark up on the food you ordered. Guys, this was all figured out long before they offered the refillable mugs for sale. We worry about it. It is not even on WDW's radar.