You more or less answered your own question. For example, let's say that Enceladus or Europa does actually indeed possess a subsurface liquid water ocean and be

You more or less answered your own question. For example, let's say that Enceladus or Europa does actually indeed possess a subsurface liquid water ocean and becomes a colony. Further, let's also assume that a lot of the raw materials needed for colonization for both Mars and the moon come from mining the asteroid belt. Thirdly, let's assume that there is a decent amount of trade between Earth, Mars, and one of these moons. When you're working on one of these stations, you're not a seasonal worker like an offshore oil driller. It takes ~5 years to travel to Jupiter, so travelling there is most likely a very long term work commitment. At that point, it makes a lot of sense to have some sort of permanent port instead of a work camp between Mars and Jupiter to stretch your space legs,, rest, refuel, resupply, seek entertainment and the company of others, buy whatever black market items are banned on Earth or other colonies, etc. Prostitution would likely make its way there to as it does with mining towns here on earth. These circumstances would be a very attractive economic incentive for some enterprising folks. In fact, if we ever settle anywhere beyond the asteroid belt, this would become inevitable. People with unbearable and untreatable joint pain may find zero gravity to be a panacea for other reasons why someone might opt for this.I'm just spitballing though and came up with this scenario in 5 minutes, so take what I say with a grain of salt :) I just think that if we become truly a spacefaring civilization, permanent habitation in space becomes inevitable for a litany of reasons. Space travel is going to be possibly the most disruptive development in human history. I'm going out on a llimb here, but I think that new religions will spring up and instead of a pilgrimmage to Mecca, the destination may be to observe the rings of Saturn. Or some people may just fall in love with the calming white noise of a warp drive generator. A 5 hr loop of Star Trek's engine noise is my go-to deep work soundtrack :) A lot of towns in the United States and globally started out as rest and refueling stops between major centers of trade. Why would this be any different? I think there are enough people here on Earth out of a population of billions who might actually prefer to live in that environment or just don't mind it in the face of striking it rich.