Most music shops these days sell vinyl, CDs, cassettes and more. But eventually all CDs will degrade due to disc rot and that leaves us with cassettes and vinyl. vinyl has already stood the rest of time, and from what I see, they are still lasting to this day. CDs will always go through disc rot, so I figure, would it be best to focus your shop on vinyl and cassettes. I don't know how long cassettes last, but I imagine they will last longer. What do you think?