The other possibility is that some humans just don't care for the whole Earth is Paradise thing so they set out on their own for perhaps a challenge. Look at it this way, if you were a billionaire and have everything you want or will ever need, where is the challenge? Money perhaps, but you start doing other stuff like charities, sponsoring research into areas of your own interest etc. The challenge of living is gone, so you find something else to challenge yourself.
Perhaps that is what caused the colonists to move and miners having a standard of living below that of Fed standards.