I'm thinking craft shows are weather and economy dependent. Hot or cold, rainy or snowy weather keeps people from attending. If people don't have money or wary of spending money, extras like crafty things are one of the first areas to suffer. Craft shows need some new or different vendors to add to the usual array to succeed. Craft show also require energetic people - promoters, crafters and attendees. So many variables for success yet some crafters persist which makes crafting so appealing.