How do I turn my product idea into something profitable?

How do I turn an idea for a product that people will only buy once into a sustainable business?

• I have identified a huge need for a product and developed that product. I strongly believe it would do well in retail in big stores like Ikea. However, this is also something I think people will only need to buy once, or at least once every several years. How do I turn a product like this into a sustainable business?

• Answer:

  People only need funerals once. Research how the funeral industry sells their service.