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I still value my cardboard game boxes, plus CD & DVD cases, and their content ... don't recall having any Blu-ray ones for games though.

They have nostalgia value for me ... nice to look at and fond memories.
I won't be installing from any of them though.

The only exception, would be the many many magazine discs I have, that have lots of demos ... especially for games not currently available, and a ton of addons (mods, maps, levels, etc, etc). I have quite a few free games spread across them too, so any of those that can be installed, that I don't have a GOG or ZP etc version of.

Like most media, you don't tend to get much for them second hand, so not really worth selling. The exception would be good working copies for consoles ... but I've resisted selling them too, including many N64 cartridges.