Interesting. I sell dozens of CDs/DVDs/Blu-rays, and even VHS tapes every week on my store to just normal every-day customers. While the VHS movies may seem odd, they often are purchased for nostalgia or because the DVD version lacks something the VHS one has. The digital media, however, is usually bought by customers who do not want to keep paying the ever-rising prices of streaming services or be beholden to companies still being around if they buy digital copies. Streaming companies lose rights to stream certain movies/TV shows, and digital stores can and have go out of business, leaving customers who spent money on digital copies, empty-handed, since they can't access or play them any more.
On top of that, Blu-ray often gives a much better resolution and color balance then streaming services do, even with 4K. That's why shows released on streaming still have hard copies being sold - the best quality will always be the hard copy; plus you can play it even when you don't have the best Internet connection.
