Your earning potential depends on your payrate (obviously) and much of it on your seniority, which you may have luck with or not. In my opinion the figures that have been posted so far are not a proper indicator of typical regional FO pay, and are definitely the top-end of the spectrum. Possible, sure, not claiming the guys here are making it up. But IMO and experience you really have to be putting in the extra effort and sacrifices to get there, and also require a bit of luck in finding the right trips, lots of it is company dependent how flexible you can be.