I think it’s a different reason. These products are perceived as commodities and the expectations are rather low in the first place. So why wouldn’t you try to spend as little as possible on a commodity when you know it’s likely to be borderline shitty or at best barely adequate? I have this strategy when buying cheapo China made crap on eBay or aliexpress: I expect it to be low quality, not last, or not even fit the purpose because the specs are fiction so I try and find the cheapest of these widgets I can buy.

Airline tickets are the same: I know I’ll be treated like shit, nickel and dimed, and have no legroom so why wouldn’t I be looking for the cheapest ticket?