Do we have any numbers for this? Are those people “falling” for it or are they just choosing to buy the upgrades? I’ve paid for good (window!) seats on Ryanair flights, I’ve paid for luggage, I’ve bought a snack from the trolley. It would make sense to me that other people might be paying for other services.
I assume if the people willingly wanting all these extras were enough, their business wasn’t an exercise in adding as many dark patterns as possible. But you are right, I don’t have direct evidence or numbers, but the behaviour doesn’t track with a company that isn’t trying to exploit its customers.