In 2011, we had more than 100 people attend the first edition of the ErlangDC conference.
Since then, we've seen an uptick on the attendance of the monthly meetups which we've been having more regularly: http://www.meetup.com/erlang/. We've been getting between 12 to 20 people attend the meetups.
We are hosting one next week actually in which Jordan Wilberding will be talking about Credit Card processing for mobile apps.
The main goal of the conference is to improve the DC Erlang community. All the money that's left over is used to support the DC meetup group.