I have re-bought CDs I lost, or albums that got scratched that I loved, or given my copy to people who I wanted to become fans, and then re-bought my own copy.

I have re-bought CDs I lost, or albums that got scratched that I loved, or given my copy to people who I wanted to become fans, and then re-bought my own copy. As for those buried tracks, keep in mind that it's unlikely that Spotify will cut anybody a check for $0.029, or even 10 times that amount. So unless those albums get listened to a lot, they're not any better off in Spotify.