I do not buy them for investment purposes as I watch anything that I purchase. The are many people that like collecting and streaming kills that if the physical media side was to go away. I know many people say physical media will never go away but less and less retailer are offering music on physical media. Like I mentioned in the above post I do occasionally rent a on demand movie that is basically streamed on Verizon Fios but now I would be Direct TV instead of Verizon. But I have rented a on demand movie here and there but I would not spend money on a movie that I would have to use a cable service or streaming service to watch because there is no physical copy. Then what happens to the money you where to spend on paying to be able to watch a movie via cable, satellite or streaming service if they go under? Basically money is spent and no movies to show for it so personally I will not go that route! And even if you can download the movies I have no interest in buying more and more storage just to have a huge media server while the media chews up hard drive space like crazy. And personally if I am going to pay for HD video and get the best picture then putting up with raunchy dolby digital is not an option for me. This is why when I have the money to spend I get Blu-ray movies for the DTS-HD Master Audio, Dolby True HD and or Lossless PCM. I do not buy movies on Blu-ray anymore with Dolby Digital only audio tracks as I have very few of those in my collection.
Renting to watch one time is something I do sparingly but not to buy flat out.
And for music I hate iTunes and for movies or tv shows I am not crazy about going back to Dolby Digital for audio and chewing up hard drive space to store content. Also when your hard drive dies there goes all that content then you have to download it all over again, no thanks. People are trading movies being locked to a format for movies being tied to a service provider. And at least with physical media not only do I get the best lossless audio but I can leave my music and movies to a family member or a friend. Not something that you can do if you buy the digital version online or with a cable service. It just doesn't seem like an attractive option to me. I am waiting to see when and if 4K content becomes available.