your missing the point, when i answer a question or help someone to answer their questions then yes the common thing to do would be thanks, even end it at thanks its just plain rude to just hang up. as for them not knowing me or wanting to get to know me i dont care its just manners. I am in sales and i dont care who you are i treat customers with respect, you have to or else i wont have a job so i tend noyt to be "uppity" so i doubt that is it.