As to the Cassese, try calling the company (or their US distributor). They should know what their equipment goes for on the used market. I did that with a coin counter I had and when I sold it, I got right around the price they said it was worth. You could also call Paul Cascio, he sells used equipment. Explain why you are asking and I'm sure he would help you.
As to the MM cmc... I would say the resale value is close to zero. But even an old car has a bottom value of a couple hundred dollars. I know... you paid alot for it but based on the history of the company and the unreliability of their machines in general plus as you said, software wise, it is at a dead end.
It's like having a really old computer that is so old no software will work on it. It's worthless to the market and of value only to the person who owns it and is still using it.
Now using it as a boat mooring, now THERE is where your value really is!!