Good eating or being hustled is a perspective thing to each his own
But your math seems correct if a lil too high. First off I sold cars for 5 years and i never heard of any dealership returning anything. Basically that extra you put down is being applied to the principle(the part you're responsible for) not the residual so you are in equity position per se... well as far as having a depreciable asset goes.
Quick side bar: If your credit is strong enough to qualify for a lease then it's more than strong enough to get a house.
IMO it's a good idea to get leases from BMW Honda Infinity Lexus over others because they keep their value better than others.
winb83 is correct in some respects and way off in others. With so many folks not being able to afford the hot new shyt the secondary certified pre owned market is booming. From experience many folks in new car sales were switching to used because there is more money in it. Alot of dealerships used car divisions frequently out sell the new car divisions. And car mfgs know this which is why leases have switched how they operate. Alot of wha you say is used to be true. Thats why you see more higher end cars now including maintenance. because if the avg BMW driver switches out of their cars every 4-6 years it would behoove me(BMW) to make sure that joint is pristine for the next owner. Plus its easier to certify knowing it was operated on by trained mechanics vs Jake from down the block