It costs money to reserve the classroom. I have to prepay the amount, and that fee is the same whether 1 student shows up or if 25 show up. It takes about 4 students workshop fees just to rent the space for one hour.
It costs money to buy the supplies and make materials kits. These things have to be preordered and shipping takes time, and it all requires cash.
It takes a few hours to create the sample project. It takes time to write out the step by step instructions and create the diagrams.
If you don't show up, the world keeps moving on. I'm sorry you missed the workshop. I have your materials if you paid for a kit, I have instructions for you to take home, and I can try to help you in an email. I'm not trying to be a jerk about it, it's just the money has been spent to make the class possible. Thanks for your understanding.