I hate to say it, but, in all seriousness, I think LucasFilm does know its consumer base. Granted, it's also responsible for creating this consumer base, so it's a vicious circle... but in the home video industry, the goal is to persuade consumers to buy what they've already bought before. And for a fanbase that's largely as crazy as George, they actually get off on buying the movies repeatedly just to see what batshit insane, completely pointless changes have happened this time! I mean, I can just imagine the nerds sitting around now, scruitinizing pictures going, "Ooooooh, look at those rocks around R2 now! That's new!"
So... yeah, basically what we're doing, only happier about it. =P