"Programmers aren't really paid, they sell services at market prices." — I guess nobody gets paid?
As a farmer myself, when I give someone something I produced and they give me back something in return, I consider myself to be paid. If I did not receive much value in return for what I gave, I'd reasonably consider myself to have not been paid well. I have never met a farmer that would consider that usage unusual. Payment refers to a transaction within the realm of a human activity. The good or service that is being traded between humans is immaterial. While you are free to define words as you see fit, your assertion doesn't really reflect how this is actually used in practice, generally. The rest of the earlier comment makes it clear that the commenter understands how a farm business works.
PS To the "clear-thinking" guy at the top of this thread...this is why...you only think your thinking is clear. If its a topic you know nothing about, devs (not necessarily you) tend to assume there isn't anything to know and that's almost never true.
</sarcasm>