I agree an IM saying "Hey, thanks" would be nice.

But, it is possible that the ones you're complaining about do say thanks when they can and it's really easy to miss someone. I know I've missed people IRL as I try to send out thankyou cards and messages for gifts for the kids and it's not because I don't appreciate them, I just tend to let life get in the way.

I just think that labeling them as rude and not worthy of your business anymore is a bit tough on somone when you really don't know the situation.

(although this all does remind me to get those thank you cards in the mail for my daughters birthday gifts) :)

...... Kendra