Actually, the thought is that fan edits prevent people from buying the available blu-rays. That is, if there were no fan edits, more people would buy the official blu-rays - perhaps not all the people who get the fan edits, but some of them, and therein lies the lost revenue.
I may not agree...
Lucas didn't win any Oscars. You'd be taking away awards from the likes of John Williams, Ben Burtt, the editing team, the visual effects team, the sound people, and so on.
That is also petty.