CDs are cheaper than ever right now so it is a great time to invest. Soon mass scale manufacturing will end and the prices on the used market will increase.
In case you ever think of streaming: CDs are better than streaming since you can choose which mastering to buy and listen to. Streaming services generally have the most recent mastering which is mastered loud with reduced dynamics and more compression (to sound better on earbuds and Bluetooth speakers). A lot of good audio equipment will sound better with earlier mastering when the CD sounded a lot closer to the master tape. By buying second hand CDs you can easily get these earlier versions of the albums. Not so with streaming
In case you ever think of streaming: CDs are better than streaming since you can choose which mastering to buy and listen to. Streaming services generally have the most recent mastering which is mastered loud with reduced dynamics and more compression (to sound better on earbuds and Bluetooth speakers). A lot of good audio equipment will sound better with earlier mastering when the CD sounded a lot closer to the master tape. By buying second hand CDs you can easily get these earlier versions of the albums. Not so with streaming