Its horrible that someone dumps a cat and kittens......although sometimes we have had cats just arrive here, and have their kittens through choice.
We have semi feral cats here on the farm, and although we have caught some and had them speyed, others we cannot catch, and there fore they breed. The kittens I give away to friends, where they will be looked after. Otherwise, I sell them. Not to make money, but to hopefully ensure the buyer has parted with money and will look after them.
At present, we have two lovely female ginger kittens, advertised for sale locally. I am vetting prospectve homes, and have put a high price on them, again , to hopefully secure a loving home.
Really, after feeding the kittens, and de flea ing and worming, there is not much money to be made.