My mom always made sure we wrote thank-you notes. My oldest sister always makes a point of it, handwritten ones, so she keeps me on the straight and narrow.

We just had a kitchen job done, new stove, hood, tiling where a dumb idea over the range microwave was. A local hauler took away the appliances.

We got a handwritten thank-you note from the hauler expressing appreciation that they were in the garage and easily accessed. On top of that the contractor, not affiliated with the hauler, just sent a thank-you note for the kitchen job.

They must be in league with my sister. Despite that they'll definitely be given a call for jobs down the road.