In my experience with custom built items cost is often cut by the builder cutting his own hourly wage. Not the greatest business model IMO.
Then people need to think outside the box a little more. Sounds like the OP is trying to do just that:
I'm working hard to source materials at a lower price and enough interest to justify my investment.
A good business model is offering the right product at the right price. Sometimes (textiles) this means offering cheap products and cheap prices and selling in mass quantities. Sometimes (carpentry) it means spending days on one item and selling for a premium. And sometimes it means finding a compromise - all depending on the market and how good you are at knowing yours.
If ChefFZJ80 learns his market and adjusts his products and prices accordingly, he has a good business model and a chance at success, whatever "success" means to him.