My experience with anything like this has been...It's another job I don't need! It takes away from your joy of doing it for yourself and a few friends. Not only that but you open yourself up to a lot of people expecting more than they pay for! I would just say " I'm sorry I have much on my plate at this time in my life and just couldn't fit anymore into it". You have not offended anyone but have protected yourself from unnecessary grief. When you take something that's your hobby or passion and put it on sale it takes on a whole new ugly face!!! I know I have person in my life that's been a friend forever and I always did things for her to "help" her out. Lots of my time and no kind of appreciation for it. I have had to start backing off...it's not easy. Save yourself & your fun & relaxation. Just my 2 cents. Pam G