Why take a beater when you could sell a new car?

Having a little one that is attends a private school and a wife that works for one we are no stranger to annual giving campaigns. What has bothered me as of late is the 'donate your car' programs many not for profits run.  I would much rather buy my car from the not for profit.

Here's the half baked idea:

Non-profits that have endowments get into the Automobile Leasing business. Use the endowment to acquire the asset (e.g. cars), lease to your constituents, collect above market interest rates, and let your constituents take the 'interest' as a charitable donation. There could even be some opportunity in the 'buy off the lease' option.  Of course I don't know one not for profit that could manage this type of process but there lies the for profit business opportunity.

Maybe the CPAs out there in the blogo-sphere can round out why this wouldn't work as a win-win.