No doubt. I remember when they could be had for around $1k. Now it's rare to see one under $5k.
I've handled a few hundred of them though. They're neat, but not shooter's and the production had tons of issues. They tended to weld up cracks in casting, every other gun had new revisions of parts, and all were hand assembled and polished by Tom prior to shipping just to make them work (if they did!)
Lots of tool room guns got out too though, not to mention the LaFrance guns and parts.
It's a neat design though and they literally invented 10mm. Too bad it turned out Cooper was broke, but D&D didn't find that out until after they'd made all the changes he wanted to see... Ouch.