It really all depends on the area you are in. My mom quit her great paying job to do crafts and she did well. She was always getting orders for more stuff. We moved to a smaller town and there is nothing around us. The craft shows we have gone to here are pretty much a fun day out. We usually make our money back and take the extra and buy other sellers stuff that we can't make ourselves.
You'll never know until you go to a couple. It's worth the try. It's always lots of fun meeting the other crafters...they are always friendly. You could always try selling online on too.