do you think gold is a bad investment given its volatility over the last decade despite it being close to the best investment over that period of time?
Again you seem utterly unable to see the difference between investing/gambling and the usefulness of a currency as a facilitator for conducting trade. Yes, I think gold is a bad way to conduct trade, no one uses gold to pay for their bread.
but if he has a profitable USD business and he believes in Bitcoin, why not do it this way?
Why on earth would he risk his profitable business on the moodswings of a bunch of daytraders? Clearly you have never done any actual business.