You've floated your seat idea over on airliners.net as well.
If you can actually build a practical better mousetrap, good for you and for everyone who flies where most of us fly most of the time when we're paying our own way.
Cost is always a concern when traveling, but so is value.
It's certainly worth some premium to have greater comfort, although how much of a premium will depend upon the length of the flight.
We've bought seats up front for four hour or longer flights where the upgrade cost wasn't too horrible and it makes a world of difference.
It's not always about saving a couple of dollars, or even a couple of hundred.
Good luck with your deign idea.
It does sound promising.