I'm not sure if this particular cable is rare, valuable or something, especially with it's PSone packaging, so I came here for some "professional" opinion. Should I keep it or sell it for something? Given that it's in it's an official product, maybe some collector can take it off my hands for a decent, fair amount of money...?
I don't know, but I used to have one and my dad added RCA connectors to it so you could connect any composite video source to your PS1 monitor.