Given how much some people have said that they would be willing to pay for 3 extra FPs per day, there would definitely be potential for some big profits for someone who wants to go into the FP+ peddling business.
All you'd have to do is buy an AP and sell the right to your 3FP+ reservations for something like $50 a day. The person buying the FPs would contact you 7 days in advance telling you what FPs to get. On the day in question you would meet up with the purchaser and hand over the MB in exchange for payment and some type of security that the band will be returned. If you could do this just a few times a month you could recover the cost of the AP several times over in a relatively short period of time. Once you really got rolling, you could have several APs and MBs in play at the same time.
I have very little doubt that if you asked someone at Disney who is in a position of authority if this is OK, they would say no. The fact that you might be able to get away with it is something else again.
Or, how about this. A large group of neighboring families lives near WDW, and all of them buy APs and decide to share their FPs with each other, alternating weekends among themselves. If you have 4 families of 4, each family could go to WDW a few days a month and each person could have 12 FP+ reservations every day they go to the parks. Do you think Disney would care if this became a widespread practice?