Peter Duniho wrote:

Net profit means commercial enterprise.

I don't fly in the USA, so I don't really care. And I agree that neither
your nor my opinion matter. This said:

Profit doesn't mean commercial enterprise. There are commercial
enterprises without profit (although, supposedly, they won't exist very
long), and you can make a profit without being a commercial enterprize.
(Winning a lottery, for example.)

Where I fly, the regulation is very different. Here, commercial means
"as a profession". I agree that theoretically this opens a grey area,
but in real life, things are pretty clear.

So as a private pilot, I am not allowed to offer flights to the public.
Even not if I ask less money than their share. On the other hand, I'm
allowed to fly with a friend, even if he pays everything and the lunch.
The idea is, that the reason of the commercial ticket is to protect the
public. Makes much more sense to me.

Stefan