I still buy CDs, they're wonderful.
I generally refuse to pay more than$.99, though.
I can do that, because so many people are donating their entire CD collections to Goodwill (thrift / 2nd hand stores).
So, the low value of the domain is no dispersion on the utility of CDs and DVDs.
It's just that CDs and DVDs aren't money makers anymore.
If you set up a site to sell used CDs and DVDs, there's a very good chance it will be a hobby site, not a prospering business.
If you doubt me, just take any popular CD or DVD from your shelf and try to sell it on eBay for a profit.
And don't try to use ebay fees against me. Every business has expenses.