Wow, this is a tough one.
You know, I think Marcs story is one a lot of people can relate too. He was larger then life to many of us 20 years ago or more and I'm not quite sure what the average age is on this forum but I'm sitting here a year away from 40.
Marc put his blood, sweat and tears into an industry that didn't necessarily put that back into him when it counted most, later in life. He had nothing to prove, he already did the thing.
Its a lot like moving up the corporate ladder in your 9 - 5. You can be the smartest, outgoing, strong willed, most down to earth employee with all the experience, skill, knowledge and qualifications for the next step in your career but you watch everyone else around you get those opportunities that don't necessarily qualify. Friends of friends is what it comes down too.
I think Marc watched what he helped create, evolve and promote go so far out of the realm of what he called skateboarding that it contributed to his loss of what he called his own identity. At no fault of his own, just corporate politics that often push the largest talents out.
It sucks.