I just booked my PHL to MBJ tickets for late January to early February. Prices did seem generally higher compared to previous trips, but they still had some round trip fares (non-stop) in the $450 range. I ended up paying ~$500, because I had to match the itinerary for another ticket that I purchased using miles.
All in all, we can't complain when you look at the fares from other cities. Prices are higher even from Newark or BWI, never mind cities further north and west. You can actually get cheap flights to MBJ out of Atlantic City, if you don't mind stopping in Florida and flying Spirit Airlines.