Because sometimes my wife borrows my CDs. Weeks later, I find them in the flooboard of her SUV, caked with makeup and with my daughter's footprints and fingerprints on them. Sometimes I rescue them just in time. Sometimes they are a total loss. Now, when I buy a CD, I always make a CDR copy and give that to her.
Until you allow my wife to borrow your CD collection, you're just blowing smoke.
lol! I stand corrected.
Back in the 70's I lent a friend my entire 8-track collection (about 10 of them in the carrying case). Never saw them again. And 8-tracks were tough to back up...