Here's a little back-of-the-envelope figuring... Let's say the Bigfoot in active production can't justify a $500 price tag. Maybe $375 MSRP for a typical $300 street price. Let's say the manufacturer sells wholesale at 60% MSRP, that's $225 which would give a dealer $75 mark-up to street. The manufacturing costs for this coil will push $100, so the manufacturer makes $125 per coil. They average 10/month, so this comes up to $15,000 per year.
Not really worth the effort to develop and tool up for such a coil.
Now you'll say, "I'll bet the market is a lot higher than 10/month!" Maybe, maybe not. I knew the last guy who was hand-building Bigfoot coils, and 10/month was about right. And, to make matters worse, half of those he built didn't work, so he built 20 to sell 10.
This would be an opportunity for an entrepreneur to step in and develop a family of Bigfeet coils, not just for White's but Tesoro, Fisher, Garrett, etc. Then your market really opens up, and makes sunk development costs more palatable. But it would still be a one-man band, not enough money to be made to hire any help.