Even just looking at hotels, that's an insane price. I've stayed at 4/5 star hotels in both cities, and they're actually reasonable. 3000 would pretty much cover any hotel providing you were a family of 4.
I could see the tour doing well though- those cities don't have the added challenges the Cape does, and there are probably a lot of parents who want to take their kids to DC as a family rather than as part of a school group. But still, you have to be a pretty hardcore fan of
ABD to fork out that much cash for DC/Philly.