Your logic appears to be that it is ‘foolish’ to refuse to do business with anyone at anytime for any reason as long as they pay.
If you say that is not your position, then you must draw the line somewhere, which the final arbiter would, by definition, be principle.
That is what these people are doing, just that their standards are somewhat higher than yours are. Their God is God, not money.
Let me be clear: you are a nauseating self righteous JERK for that statement. And ignorant to boot, to think that my god is "money" and not God by what I said. They have fallen for a trap. It's obvious I would bet that their faith is part of their business and they've been set up just for this kind of thing.
They would have disarmed the entire episode had they simply agreed to the gig and charged a premium for it. Be wise as a serpent, and gentle as a dove. In that passage is nothing about being a self righteous ignorant jerk. Maybe you should look it up.