First, fans buy physical album collections, and the number on the software is dedicated to listening to songs. Singers usually release physical albums containing their classic songs. In this case, fans buy physical albums for collection convenience. For these people, the physical album is more collectible and can make people feel the beauty of the album, so they will buy digital albums to listen to songs and buy physical albums for collection. Each has a different function.
Second, many people buy physical albums in order to get the autograph of idols. Now many singers have a large number of fans. These fans buy physical albums, which are actually signed for idols. Generally, physical albums will have idols' signatures on them. Usually it is not easy for these fans to get the autograph of their idols. Of course, they have to buy physical albums when they have the opportunity. This can not only support the music works of idols, but also get their signatures. For these people, buying physical albums can kill two birds with one stone.
Third, some people buy digital albums for retro feelings. Although society has developed and many places have entered the digital age, people still feel retro. Just like before, some people always loved vinyl records, just like that style. So these people buy physical albums for their feelings and let them feel the retro atmosphere.
If you have other views on this, please leave a message for discussion.