Interesting video and it would make sense that it'd be hard to find any real tangible answer, but couldn't it just be that doubling anything that you're regularly exposed to just automatically seems like a large jump, because it is? (Conditioning is the term maybe?) If you eat a single cheeseburger every single day for lunch and that's what you come to expect, one day having two cheeseburgers in front of you will seem like a lot, until you get used to it, then suddenly, two cheeseburgers seems normal. Then if you ate two cheeseburgers for lunch every day and one day are given four, suddenly that seems like a lot. Or if the reverse happens, and one day you're back to a cheeseburger a day, a single cheeseburger seems to be so little.
I think that from a logical perspective, that makes sense. But I still couldn't find any research about it, which is kind of silly. There's no research on the impact of "luxury" or the perception of "more". But you are totally right. Any increase will be noticeable until you adjust to it. The friend that gave me the idea says he's already used to the 280 characters now, so...¯\_(ツ)_/¯
You and me both! I'm imagining a video that starts like, "If an apple a day keeps the doctor away, what does a cheeseburger a day do?" :D