Maybe Mark is just more willing to respond, and more patient in responding, than (at least some of) the rest of us.
Yeah, that's indeed seems to be the case.
At one point I was going to respond too, but IMHO what's being discussed here is pretty obvious... If there is one thing that I could add here, it's this:
If there are two prospective businesses, one more stable and/or lucrative but for which you have no desire whatsoever, and the other one that is [far] more risky but for which you have a true passion, by all means go for the latter. And not only because it will make your life more interesting, but because you'll have more chances to succeed.
Note that I said "businesses", not just "areas of interest"... There has to be a business case in what you're doing. With that caveat, everything I said stands.
Anyway, Chris, I wish you best of luck.
P.S. Downloaded that PDF and enjoyed it a lot. Even decided to do a bit of B&W myself in the near future. See? You're already changing this world a bit...