The idea you can "timeshare" 1,000,000 albums for the price of one is enticing. Assuming 1n hour/album and no eating, sleeping, working-type distractions, it should take a bit over 114 years to listen through all of them. Of course, by the time you've finished your first pass, over 90% of those likely are no longer available. You could just start over, knowing you'd rarely be subjected to the same music twice.
Personally, I have a lot of albums that are worth more than that to me. I suspect a lot of them are not available streaming (local artists often self-produce). Increasingly, these are crowd-funded through ArtistShare, GoFundMe, etc.