The time spent fixing a bug for $100 doesn't get magicked out of nowhere - that's time that could be spent meeting friends, doing sports, spending time with family, reading books, creating art, enjoying good food and wine, learning new things, or even sleeping!
For a similar concept expressed in a wordier way, read about Maslow's hierarchy of needs [1]. Our hypothetical developer's physiological and safety needs are fully met - and their unmet needs won't be much helped by $100. I avoided this and chose the wording I did because some of Maslow's wording like "self-actualization" and "transcendence" kinda invites confusion IMHO.
Far less confusing and questionable, I thought, to merely argue that sex is more fun than software development. But apparently not...
[1] https://en.wikipedia.org/wiki/Maslow%27s_hierarchy_of_needs
But you made the point badly, confusing things by adding in the date night - so that instead of comparing "fix bug for free" vs "fix bug and be paid, but much less than their usual hourly rate", you instead compared "fix bug for free at a time that suits them" vs "fix bug at an inconvenient time and get paid less than their usual hourly rate".
I can't actually work out why you bothered to bring bailing on a date night into it at all...