Collector Gerbers are nice, I've had three of the Mark II's and still have a Mark I. Functionally they cut - but don't offer the utility for general use like a good folder or camp knife, because of the steep grind angle and lack of belly. They are just a stabbing sentry dispatcher, which never really happens in combat.
Certainly not legal carry in many jurisdictions. I'm sure they will continue to appreciate, so are probably a good investment, as there will always be someone who thinks they are a really cool commando dagger like I did. But not really useful, which I now insist on in my bladeware.
Of course, I've seen the retro daggers at BudK for less than $15, and for show, they look worth the money. Sheath included, too. Might even pick one up for Renaissance or a letter opener, which the Gerber did well at, too.