Are we really arguing about this?
How about this?
Your wife happens to give you some money before your trip and you use that money toward helping her get to her meeting.
Even better. Your wife happens to deposit the amount into a joint account in your names, you use some of it to pay for the flight.
As mentioned before, the intent of the Section is to weed out people who are trying to operate for hire without the proper certifications.
Neither of us is really licensed to practice in aviation-related law, however, so we cannot legally advise you as to what is legal and what is not.
http://en.wikipedia.org/wiki/Attorney#Unlicensed_practice_of_law