The question is whether you'd leave Earth and all its diversity and opportunities for a life as a gypsie wandering from world to world, locked up in a little ship with the same several folk for a week at a time, you and those several then dealing with complete strangers in a new place with different gravity and different air and different laws and different and sometimes bizarre culture for the next week or longer. It's more a question of which worlds are more likely to produce folk interested in living a pretty much rootless existence with no long term friends or family other than those within the confines of your ship.
Well, some worlds are like small towns. If that pop digit is, say, 3....
But this takes us back to my original point: oppressive government, toxic atmosphere ... there will always be some adventurers from anywhere, but the money's on the worlds you're more likely to want to leave.