Judy, that is awesome that you are part of a co-op, too! Let me know if you have any advice for our newly formed one. I think we will each work 2 days a month. I am happy because the building we found has space to have a kids' play area, and i think there is a yard out back where we could also do some kiddie stuff. Another member & i both have young ones, so this is important, and i think it will also be attractive to families passing through. We have a good, thorough business plan, with a board, a gallery director, and a really excited and motivated crew of people.
Couple of things we have learned in the co-op since it started:
1) A lot of folk come in assuming whatever they make will sell like hot-cakes. When it doesn't, they get a little lax about promptly paying their share of the rent, and signing up for booth-minding time.
2) It helps if you have a group who are supportive of each other, and don't want all the shelf space for themselves. We had a guy for awhile that "took ownership" of a large area, and also wanted to scatter his product over the rest of the booth as well. He left in a huff when the primary (the gal who started this thing) and I were re-arranging things after an expansion. He wasn't happy that he had to move his things to another area to make room for a new member.
3) It's a good idea to keep a list of prospective members, so if you have one of the members leave, you can get someone in to take their place right away. That way, the rent gets paid.
4) What we have done is figure the rent/electricity costs for the year, based on a certain number of 'open' days - days when the shop is open for business. The rent charged is a little higher than the actual costs, and covers gaps when we have a member drop and before a new one comes in, and also pays for booth supplies - office items, display items, etc. We also have several fixtures that have been donated along the way, but there are always incidentals that need to be paid for.
Hope this helps! If I think of anything else, I'll send it your way.
Best of luck to you!
Judy