I might be completely off on this but I truly think if Mark got his life together and started making amps again (with a good team) and explained that it might take awhile, but wants to eventually make things right with those people, folks would be fairly understanding. When I say that, I mean like he has a Friedman-type operation going, making amps like an assembly line, and taking a bit of the profits and either refunding them as he can, or getting them their amp.
I'll always said that the whole tragedy in this is that the guy makes an amp with tone that several of us have already dreamed of owning. It is like the movie "Good Will Hunting". He could be sitting on a potential goldmine, could be doing guitar magazine interviews, etc. I get it, people's lives get screwed up by drugs, alcohol, or medical issues, etc. My bud Keeley (and this is openly known information), struggled with pill addiction after his first set of pedals came out. He almost lost everything. But, he turned things around and is doing better than he ever has. He even lost the shop in a fire during a particular period and was still able to rebound. Can always turn things around. It really is sad.