I don't remember DC's crowd ever being this hype. Most people that go to WrestleMania stay in the area for the whole week and I've already seen people on Twitter talk about going to this show, WrestleMania and the night after.
DC has a nice smark base. ROH used to run shows about 30 minutes from there that were always sold out. Alot of them probably decided to show up and droves for the Mania go home.