As any business major can tell you, the key to making money on a product is the law of supply and demand. The key here is demand. The best ideasthe ideas that changed the world and made the inventor a ton of capital—aren't necessarily the ideas that cater to a customer with an uber-budget. The wheel, the mouse trap, even the scrub-daddy are multimillion (even billion) dollar ideas that everyone can use, most can afford, and solve a basic problem.
Personally, I don't hunt, full disclosure. I've never been duck hunting. However, I have noticed that those I do know (who hunt) have duck decoys—lots of them. Different decoys for different types of ducks, and often they come back with fewer decoys than they left with.
Also, hunting is boring. Go out to an area and wait, and wait, and keep waiting until eventually some ducks show up. What if you could make the waiting process more fun? What if you could drive a duck around on the pond, or even let it drive itself and navigate...