Whoa there Galaxy,
You are correct that the fractional business model is completely different from the airlines. However, fractional owners are in the programs because of liability concerns, predictability of expense, corporate public image, and most of all: CONVENIENCE. Any objective analysis proves beyond any doubt that block charter for fewer than 150 flight hours a year and whole aircraft ownership beyond that is CHEAPER than a fractional share. Most everyone who shills for a fractional fails to include the difference between original purchase price and the end-of-contract buy back price in the total cost of the five year contract.
A good flight department manager, with the help of the owner's attorney and accountant will generate a lower cost per flight hour after five years and they still own the airplane five years later.
Fractional ownership is still a viable business model but because of reasons other than money. While the cost sensitivity of a typical fractional owner is pretty low, that doesn't mean there is an endless amount of money a frax owner is willing to pay.