The kids sold lemonade and snacks at an Oklahoma City metro-area gathering on Saturday and cleared $10 each. S2 fell asleep on the way back but S1 was full of excitement when he got back home at 11pm (at which time I talked to him over Skype).
He had ideas for how to make more money next year: (1) better stall location ("our tent was right at a turn and people couldn't see us"), (2) different products ("the tent that had plates and real food sold 300 dollars and some people went and bought from them a second time") and (3) a more enthusiastic sales force ("S2 would not ask people if they wanted to buy a bag of snacks"). The only thing that was missing was a PowerPoint slide with future expected revenues if these changes were made.
Unfortunately, the excitement turned to disappointment when he started leafing through a toy catalog to see what he could buy for $10. It doesn't go that far, he quickly realized. I am afraid that he's going to shoot for that $300 product-line next time and that we will get stuck having to make it in our kitchen.