If you don't understand that when you lease your entire federal tax credit goes straight to the leasing company, which, out of the limited goodness of their hearts they may return to you, in part, in the form of an inflated residual or reduced capitalization, then you are a fool, full stop.
(do the math and see dummy)
If you don't know how much of that tax credit you could put in your own pocket, in cash, then you are a fool, full stop.
(Impressive grasp of the obvious)
If you don't at least ask whether the manufacturer is offering equal value incentives to cash buyers as they are to leasers, then you are a fool, full stop.
(even more impressive grasp of the obvious)
And most importantly, if you honestly believe you can outsmart the leasing companies playing their game on their home court, then I've got a bridge for sale, cheap.
(lease companies make money the same way banks do - they charge fees and earn interest. It's a competitive marketplace so charging too much will be uncompetitive. Yes, math will show you their total take, and you should figure that out before making a decision. Don't try to claim the point I was making as your own.)
The math is all in. Leases are fine for people who (1) can't afford to buy, (2) can't claim the entire tax credit, (3) have always had car payments and can't imagine being without them, or (4) look forward to owning a new car every few years.
(You presume to know all the reasons people might want to lease, yet only come up with 4? How about "have a lower car payment?", "not be exposed to capital risk." Etc....)
Believe it or don't, but not everyone is in any of those categories. Those people aren't fools, in fact they might very well be more financially capable than the people who do fit into those categories.