You never watch a film a second time?
Some people like film quite a bit, and may watch a film several times. There are films out there that were released on video, then pulled, and are often impossible to see today. There are films where a particular version was released in one format, (laserdisk, for example), but that version is no longer available in any format.
But you know what? I simply enjoy film and watching film. If I want to go back and watch "The Road Warrior", I can, because I purchased it a good many years ago. If I want to see the version of 1776 where the congressional congress spills out into the streets still sings, I can, because I bought it back when it was available. I picked up "The Fall", knowing almost nothing about it, but having heard good reviews. It cost me just a bit more than two tickets to a movie would have cost, and I can show it to friends who will enjoy it but won't have seen it.
Just because you don't enjoy something doesn't make it a waste of money to the person involved.
And a quick comment about having bookshelves full of books. I have no idea how many books I own. I've got a twenty foot wall of bookshelves, floor to ceiling, full of books down stairs. I've got at least three bookshelves full of books spread over two bedrooms. I don't do it to show people I'm smart. In fact, the largest collection is in the basement, and it's rare for me to ask people down there, and the other books are, as I said, in two bedrooms, and visitors aren't often in those either. I have those books because I read. I read a lot. While the non-fiction doesn't get much use anymore -- except for the ones sitting on my desk -- the fiction gets looked at and read.
You can complain about my 1000 LPs and my 400 CDs too, if you like.