First off it would not be out of the ordinary for me to play 5 to 10 hours of music (of all varieties of sources) in a days’ time and that does not include many nights that I play music radio while sleeping.
You seem to place your likes and usage as some kind of standard which it is not. Next I ONLY have slightly over 2,000 albums, now that is by title and not counting for pieces that I have duplicated (for my personal usage) or a couple units that have turned up missing. Through the years My musical tastes have changed and I go through a wide variety of listening moods so I might pick out some old classical albums on week and slide into Broadway-show tunes the next and all the way to bluegrass the next. There are albums that I haven’t listened to in over 10 years but that does not mean that I will never listen to them again. Also at the age of 70 I have the time to listen and a person’s memories are sometimes all or at least the most important thing they have left in life.