I've never tipped delivery people either. Now, I might "ask" how much it might cost me to have the old couch removed and see what they say.
Reminds me of a couple months back when we put some cabinets in the trash. The garbage man actually came to the door and told me it was going to cost me an extra $20 to have them taken away. I told him, no, thanks, DH would take them apart and we'd put them out that way. I thought, what a snake, trying to make a quick $20 off of me. So, here I call DH and my friend and relay the story to them about how the garbage man is trying to rip me off. End of the day comes, and I see a garbage truck pull up in front of my house, the same garbage man gets out and throws the cabinets in his truck. Boy, did I feel like a schmuck! Good thing I wasn't angry enough to call the company and file a complaint about his actions.