also, its not like Seth and Co. just sit around and think of cool bands and then call them up and fly them into town. Bands have to be touring, they have to be coming somewhat nearby DC in the first place, they have to want to play DC, they have to be able to sell more than 200 tickets (i would think), they have to be in town on a night that no one else is scheduled at the club.
All these things come into factor.
I have spent time helping book DJs at a weekly club and its not easy and you dont ALWAYS get all the acts you want, whenever you want them.