I've been to both the NYC and DC area shows, and you really cannot compare the two.
The NYC area has to be one of the largest markets,in the country,for anything electronic,including high end audio ,and video. It's the biggest media market in the world,so by that very fact,the audio shows there are sure to get the bigger,and more popular,brands on display.
The DC area is smaller, and so attracts more of a local market.
Now,after attending most of the Capitalaudio Fest shows over the years,and being a local resident,and not knowing how the attendance
was,and if any profit was made from the show,I offer a couple of suggestions for,hopefully,future shows.
1) Spread the word..advertise more in the Northern Va, DC, and MD
areas. The show was like a well kept secret. Don't advertise to the "believers", but try and expand to new customers who are not too familiar with audio.
2) Get local retailers involved with their own displays( think Sound by Singer,Lyric HiFi,in NYC) such as JS
3) Get some of the indie records stores to sell at the show. Places like Trax on Wax,Record and Tape Traders etc.
Perhaps with some of these ideas,it may generate more attendance,which might mean,more profit,and more Capitalaudio Fest shows