The machines eliminate people. They know that they pay for the machine once but all the workers they have to pay every week. They've run the numbers, and know for certain getting rid of workers will increase their profit. They know that it will make them more money than any money they'll lose for not asking if you want to supersize it. They know that the machine won't call in sick, leave early for a family emergency or short the cash drawer because it can't steal. If it does break, it can be repaired quicker than a doctor can cure a sick human being. My personal solution is to not buy fast food at all but I know I'm probably in a smaller minority in that solution than I am being ABDL.
Hugs,
Freta