125k after 5 years very doable.
144-168 hrs/mo is a pretty typical schedule.
PAs who only work fast track(probably 60-70% of all em pas) are perpetual scut monkeys seeing low acuity patients all day long with minimal sense of accomplishment because most of the pts would have gotten well anyway by staying home and taking a few ibuprofen and some Sudafed.
the 40% of em pas who work in higher acuity areas have more responsibility and enjoy their jobs most. the PAs who work rural/solo or have great roles at urban trauma ctrs where they can see any pt and do any procedure are the happiest and best compensated em pas of all. this is probably the top 5% of em pas. a residency puts you in line for those jobs, or you could trudge up the ladder of crappy jobs, each slightly better than the last, over 15 years before landing a really good one, like I had to do.