I think you're wrong there. What you're saying might the case for most people, but there are always collectors who are willing to pay for officially released material. Specially if it's an officially pressed item, with material that will likely never be officially released.
If things didn't hold value just because their content is widely available on the internet, people wouldn't be paying thousands of dollars for Smiths test pressings. If I had $3000 to burn, I woulnd't mind buying a Hand In Glove 7" negative sleeve.
Of course, vinyl holds a lot more value than CDs, but look at the That's Entertainment CD that just sold on ebay a few days ago. Condition: "very good". Sold for $295. And it has 2 of the most popular Morrissey songs. This CD has been selling for similar amounts for past few years.
For this DVD, I'm sure that if it leaks, a lot of people wouldn't bother with the original disc and there will be obviously less competition. However, there will still be plenty of collectors out there who what they can to get this.
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