Peter if you haven't found anything yet, you can check with Scott Barmby and his team out of Chesapeake Beach, MD:
Chesapeake Bay Charters - Rock on Charter FishingTheir prices are more in line with the market. $1500 sounds like a "don't really wanna do it" rate for 2-3 on the Bay, even if you're just burning gas and trolling for 6-8 hours. Scott runs the full day seminar style Orvis Fly Fishing Schools in the area. I've fished with him and his guys twice and am pleased with the catch and their work. They offer fly, spinning or bait.