The cats I just feed because I refuse to let them go hungry.
"He who feeds the cat, owns the cat. Or the cat owns...or something...hey, this bowls gettin low here!"
One of mine I've had for 5 years and was semi-feral, and she's still jumpy/frightens very easy (the other week I was walking through the house with a pair of socks in hand and she freaked out). She pretty much hates everyone else, but follows me around the house like a dog.
Thanks for looking after those someone else chose not to. They can end up being the best pets.