Of course it is totally impractical. Any vehicle that requires 40
GALLONS of gas to transport one person 50 MILES, has no chance of
becoming main-stream. In fact it's market is smaller than that of
$250,000.00 + sports cars.
To be able to fly 10 feet high means this can't go over a tractor
trailer.
This is a toy. The only potential market would be for promotions.
Maybe you could have a race. Maybe a company could put their name on
it and show it off at a fair or festival.
Moller's Sky-Car does not work, but IF it did, that could have some
real potential- this is just a toy.
That said it might be fun to try it once.