The math is just as flawed in your equation as the way you calculate it shows you have never had any experience in the food service industry to know the true costs.
Disney owns most of these machines (albeit they were handed to them for free) - no leases involved. The exception being are those machines at the water parks that use the barcode validation system (and the all-stars RFID validation). Those did involve them putting in a slight investment, but that's out of scope for the discussion we're having on the regular machines. The overhead for these is so tiny, it makes the syrup look expensive. All those costs you listed add up to a big whopping 0.0001 per drink for Disney. Based on disney's infrastructure, utilities have always been minimal. And remember - water is free. Not literally - but as they offer it free to all guests, it cant be used in the equation to determine what the cost is to offer a carbonated drink (and it isn't included in the cost internally when they budget it, according to some pricing analysts that I know over there).
Literally, soda is an afterthought for disney. The ONLY reason it was being used to stop abuse at the All-Stars is because the value resorts are where the most problems are. And no, its not because of the re-use of old mugs - but rather the use of water bottles, old cups, random mugs...etc. Disney does not care or have any concern about guests re-using old resort mugs from past visits. It's the other use that has them worried, which are rampant at the All-Stars due to all the tour groups/cheer groups/teen groups that go there, un supervised.
The costs to start up this RFID isnt cheap - and its very unlikely we'll see it spread through the rest of the resort. Each RFID chip comes at a cost of $0.24 per cup. Add that up, and you'll see why its not a cost Disney wants to incur property wide. When they pay $0.01 per drink - its an investment you only want to apply in extreme situations. Rest assured, I dont think we'll see the Yacht and Beach Club or the Contemporary with these machines anytime in the near future.