Bingo! This is a big factor in why we keep returning to Jamaica. Even from PHL, its hard to beat the relatively inexpensive cost and the fast, direct flights. The other factor, of course, is the culture and vibe that you can't find anywhere else.
BTW Packrat, we visited the Out Islands and you're not missing much. Spent a week in a cottage on Elbow Cay and found that place lacked any real culture as the locals were either expats or decedents of British loyalists that left the US after we won the Revolution. Hope Town is pretty unique but you can get bored pretty quickly if you don't own/rent a boat to travel to other islands. Also it's pretty expensive (airfare is ~$800).