Awhh sweetie, I think it's important to have at least some respect for your work. It's cool that you don't mind people referencing and stuff, but if anyone is making money from your stuff its important to take action, you put time and effort into your stuff you at least deserve your dignity for doing that.
Because people think this way, people who actually sell art have a hard time because others are just used to using things for free, and its really disheartening when this happens, because artists deserve a reward for their hard works when using for commercial or commission purposes. People start saying things like, "Oh, this artist lets me use their stuff for free, you should too." Which isn't right in my oppinion |D