Being rude actually does have a material cost sometimes.

For example, I had someone come to my door once with an absolute shit attitude to pick up something I sold to them and I immediately dropped all the little extras and freebies I had related to that item that I was happy to give away initially. I'm not saying be nice to people JUST so they might give u free stuff, but it sure does help sweeten the deal for them.

Just saying, for anyone who likes to reply "it costs nothing to be rude either" when people say it costs nothing to be kind.