Definitive evidence? It's the "demand" part of supply and demand. If you really need a specific, American laserdiscs and tapes were pan and scan for years until enough people complained, particularly enthusiasts (writing to things like the laserdisc newsletter and bellyaching at consumer electronics shows) and if you're old enough you should remember the endless pro-letterboxing push to counteract all the old ladies and soccer moms who hated seeing black bars on their tv). And Warner Home video had no concept of a "Donner Cut" before the superman-fans were beating that drum from the early days of the internet. It was only Donner's participation that came late in the game. (By then they would have just done it without him and called it something else, like the extended Alien 3. Another dvd that exists because of fan noise.) Or maybe the home video industry just does things based on their own whims and artistic merit, maybe I'm nuts.