It has been suggested that's part of the reason for the price surge. A lot of people just aren't buying from McDumpster anymore and so in order to hit the same levels of year over year profit increase they've raised their prices to make up for lost sales. So they have significantly fewer people paying significantly more money for the same shitty food. Ultimately this will lead to a death spiral, but they're so massive it's going to take a really really long time before they hit the bottom.
But here’s the really annoying thing about McDonald’s: they don’t care if their sales trend towards zero. McDonald’s makes all their money on the real estate values of their restaurants, not on food sales.