Some of the arguments here strikingly reminiscent of the devoutly religious arguing that, without religion, there'd be no ethics, and with much the same flaws in reasoning.

Before money, the so called "scut work" got done because it was recognised that it needed doing. I imagine that Star Fleet personnel would also recognise that, if they didn't crawl around inside a Jeffries Tube, something would stop working, the ship would break, and somebody could die.