I'm a custom jig maker, and have been doing it for over 10 years. I can tell you that with the advent of the internet, there are more custom jig makers now then ever. I think because there is so much info available to people, and many of them think that it is cheaper to make them than to buy. However on a small scale it is not, if you are going to invest money into it and do this through the good times and the bad, then you will make some money. Let's face it we won't quit our full time job. I know guys that are selling custom jigs complete for $2.00 a jig. Lot of these guys are in the southern states, and I believe the labor wage is lower so they can sell it for less. Also there are a lot of jigs that are just plain crap. It all depends on what you want. If you want something special that you cannot find in a store, the custom guys are there to help.
I make jigs because it is a passion for me more than a business. I love doing it and it challenges me to be really creative. Also all said and done, I can make some gas money for the boat, and most of all, I can get so much information from other guys that fish.