I didn't do well at the Big Apple Con, but talking to other creators, I don't think most artists did well either. I usually have a steady stream of drawing commissions, but I only got 3. I think it was largely due to placement of the indie artists. The convention was split into 2 levels, and even though you walked by the indie artists on the lower level as you came in, most people just went right on by to the main floor area of the 2nd level, and when they were done they could exit another way. I like when conventions are all on the same level in one big space, like Boston Comic Con and Baltimore Comic Con.
But the good news was that I did find someone to help at my table for when I was sick. Hiring an assistant has been something I've been thinking about, but being sick gave me the push to try it. I'm glad I got to do so at a smaller convention rather than take a big risk at NYCC. Even though Big Apple was slow for the most part, it was a great opportunity for someone new to learn stuff. If you table at conventions or any kind of show, and are feeling overwhelmed during busy times, I definitely recommend finding helpers!