Marty.McFly said:

Back then there was no Twitter of FB. I strongly believe that's the main reason so many people now know what crap the box set is before buying it.

Just imagine what it would have been like if Twitter (and overall number of people using the internet) existed back in May 1999 or in 97 - I imagine the backlash against Lucas would have been even worse than it is now.

I immediately thought this too. YouTube came the following year, and it wasn't really until the last few years that it's in Joe Public's face, as of course is Twitter and Facebook.

A little ironic how the latest changes in tech is having an effect on Lucas' changes in his classic movies.