I don't think there's much luck involved. What community supported agriculture programs need to function are a small field of OK land - a couple of acres can support scores of families, and careful sustainable cultivation will make the land better - and enough families in the area (= "available") that will pay for and eat what is harvested when it is harvested - seasonal produce, of very assorted sizes and shapes and with holes and nibbles and whatever other damage it sustained in the ground or during harvesting (="misfits"). Oh, and people who will volunteer in the field when the growers put out the call for some extra hands for an afternoon or two. Or take surplus produce 10 miles into Swansea to give it to a cafe that caters to the homeless. Or attend meetings to reflect on what went well and what didn't, and decide on what to grow next year. It's about local focus.