Because they are not friends, just acquaintances/contacts who will use each other.
Because you don't come to mind on a day-to-day basis.
Because they need and the reason for the call
Because they value your time and deal to the point !!:)
It's still better than boring chitchat.
Most people are like that. They talk, at the end of the conversation. They hit you with the news. Hate it, they suck.
cause they need something -_- damn i hate this