Understood, however an aircraft owner knows that for owning an aircraft the largest costs are running it versus the purchase price and this arrangement helps owner 1 because he only has to pay for half of the 100 hourlies roughly, half the hangar and half the insurance.
Maybe this should be approached differently, maybe as an equity partner.
Owner 2 buys in at $50,000. The aircraft is sold after 2 years for $200,000 and owner 2 gets back his $50,000. Owner 2 can't conceivably think that he would get back $100,000 for his investment. In 90% of GA aircraft they will depreciate anyway so this shouldn't come as a surprise to owner 2.