Only one person signed up for my painting class, so it's not happening. Even if I get the money from one person, I end up losing money teaching that one person for 3 hours. I'm only charging $40 per person for a three hour painting class. I have to buy supplies for a still life and paint them - let's say that costs around $15 for supplies and the equivalent value of the paint. I have to spend over an hour and a half in transit (total) - so let's say that's about $7 in gas. It also costs $12 per person per 3 hours' use of the studio.
Even with that low estimate, I make $6 for almost 5 hours of my time (including transit). It's really not worth it. I had to make it a minimum of two students to hold the class, because then at least I could make more than $20 for my afternoon!
You can even look on the studio's website and see that people have posted on the message board specifically requesting drawing and painting classes. Until now, the only classes offered have been jewelry-making classes, one soap-making class and one fruit-carving class.
JewishGuy suggested that the reason is the class is too expensive. I don't think it's expensive, even compared to the other classes in the same studio. Most jewelry-making classes are around $30-40. These classes don't provide the students with supplies, either, so it's not like they can reasonably say to themselves, "$40?! And I have to buy my own paint and canvas? WTF, mate?"
Any single-day painting class at any studio in the city costs at least $100 if not $200. I have looked, because I was interested in taking one of these workshops. They also do not include supplies. Maybe students in this area (about 45 minutes from the city) would take a $15 painting or drawing class. Maybe they think it's only worth $15 for three hours of an instructor's time because they don't realize the inherent costs of renting studio space, setting up still-lifes. If the reason they don't want to take the class is because they don't want to spend $40 for three hours, well, that's just really annoying.
I'd rather believe there's not enough interest...