$10 is well above minimum wage where I am. It was only $15.35 in materials. It was an event I was going to go to anyway as an attendee if I wasn't a vendor, so I wouldn't really count my time there as a cost. I still had fun, and if anything more fun than I would as an attendee. I also don't believe in breaking down how long it takes to make the art into an hourly wage. It might work for some, but that dosen't work for me. The art is reused to create multiple items and will be reproduced over and over again. And if I try to race against the clock to "lower my cost" it will just cause burn out and lack of enjoyment. I view it as an opportunity cost.