I managed to purchase this section of farmland for an excellent price of 0g.
I think I managed to "fix" it, though...
However, that was the only piece of land with a cow (that I saw, at least). Why is that? That's why I wanted it initially but felt bad about getting it for free.
All the other "cow farms" have been fixed so they sell for 10,000 gold and not 0. The mistake was done 10+ years ago when i had to make severel copy areas to have enough farms and the cow area suddenly was remade an active farm instead of NPC owned. Forgot to alter a variable on the sign back then - gametechnical explanation...
Well, I went and bought another farm (without a cow : /) for 10k and have planted a few crops there. But maybe I'll get 10k if someone buys the farm I put up for sale! No idea!
Just to be clear, though: each of the "farm" areas has only one farm with the cow (which is also purely ornamental and technically adds no additional value to the farm)?