Yeah, it depends on the person. Some people in my res cooked for themselves a lot, and some people just stuck to the meal plan. There usually isn't competition for the stoves, but there's nothing wrong with using them
Nothing is provided for you, by the university, although each floor gets a certain amount of money to spend, and depending on the CA and how much demand there is, it might get spent on things like salt or cinnamon or a pot etc, for the whole floor to use. I wouldn't bank on it, though