Yes there is a market. Its just figuring out the "niche". Ive been working on my side company for about 2 years now officially. Just branched into plastics. As others have said...think outside the box and find new things. Also higher quality or things that cannot be found in the store. I make jigs, spinnerbaits, buzzbaits, a bunch of different jigheads/shakeyheads, airbrush baits and now plastics. Find the niche around you. Feel free to PM me with any questions.
People will pay for quality. I sell my jigs more than most cost in a store, for example. But they are tied, and mostly custom-ish colors. I also offer options for different hooks. Ive got a guy that likes the thinner wire skipping jigs, in one color. Buys 10-15 at a time. All because he cant find the hook he wants in storebought options.