Continuing the discussion from Celebrate Star Trek’s 50th anniversary by revisiting Deep Space Nine:
Part of the TOS setting was about this, the idea that things got boring on Good Old Earth, so the Star Fleet is all about curiosity as a motivator, exploring strange new worlds and so on. The premise was that most of the ship’s crew would be motivated not by pay or amenities, but the desire to explore. Miners and colonists were out there not to get rich, but for the thrill of being on the frontier. The TOS script writers were warned not to mention Earth culture, except with a throwaway line like “on Earth, we used to have similar problems” or “like your historical stock exchanges” with a quip about how primitive and inefficient it was.
This is why it was referred to as “Wagon Train in space”, because the protagonists of that western series the crew of the Enterprise was not supposed to have backup help. The idea of being out there on their own.