Re: never forget though
"you are up against the light bulb principle too"
Hmm, interesting way to put it. West of the Atlantic, it tends to be known as the Vacuum Cleaner Principle, as we're familiar with Kirby and Electrolux vacuum cleaners that have been around for three generations or so, yet you don't see them still being sold today. It's always Hoover or Oreck or whatever. That's the thing about one-offs. Sure, you can steal the market by selling a one-off...but then you starve yourself out of the market because once you sell it, you never hear from the customer again.
Some things just don't work on a capitalistic incentive because the focus will always be on the short term: on repeat business. You need a different incentive to get long-term work done like permanent medical solutions (cures and permanent vaccines vs. treatment regimens).