I have only been involved with a few craft fairs - (I am in a very rural location) - its always hit or miss with me too. Last time I was determined to sell everything - so I priced everything completely at my cost - you could not find a lower price - I think I sold maybe 4 or 5 items - nothing big - everyone around me had the same problem. I think craft fairs around outdoor events or festivals are probably better or waiting until the holidays in the fall is best. Just keep trying - it will work out when you find the right craft fair.