I don't ever call people just to talk. Unless it's a girl, and even then the point of the call is to build more comfort. But I never just chat with my guy friends. I'll call to make plans, but never for no reason.
Yes these people. They only bother with you when they want some help or whatever. You help and then they don't make contact with you again until the next time.
Oh I see. THOSE people. I had one friend who would call everytime she'd broken up with some boyfriend and needed emotional support. Eff that. If you notice the trend just break all contact with them. Parasites.