100 cows and then none, that wasn’t for us. We have not made any calculations, as this is no food industry.
Of course, we have cows. But only four, and they are mountain cows, and we make no profitable calculation on them.
Then we have a lot of other animals on the farm as well. We think it is more fun (and more difficult, which in a way is similar to fun) with several different animal species. If they are endangered (unprofitable) then all the better. Anything expensive and difficult is a bit more fun.