I quit making strings at tournaments several years ago. It's just not a money making venture--if you can pay for your spot and trip, you did well.
That's besides gathering up and hauling your supplies, risking getting it all wet and/or dirty, being stuck in one spot the whole time you are there...
I was generally the first person at my spot in the morning and the last to leave, Thursday through Sunday. My wife would get me something to eat and I kept bathroom breaks to a minimum. If I was set up under lights, I might work until 9 or 10 pm and back at it before 7 am.
I could make up strings ahead of time, but with at least 4 different materials, three different servings, at least 3 different sizes of serving, over 30 colors of string material, longbows, recurves, low strand counts, 2-bundle, 3-bundle, endless, Flemish, etc. etc. etc. a fellow could have literally a thousand strings on hand and not have the one someone wanted.
It served it's purpose though--now I don't have to set up, I get plenty to do in my shop.
Anyhow...that's why you don't see a lot of string makers set up at tournaments--especially those of us who have a well established business and clientele.
I will be there with BCY though, and plenty of string making materials.
Chad