"Thank You" is right up there with "Thoughts and Prayers" in the list of worthless evil platitudes. I always remind myself that you don't INTEND to be evil and stupid... you just are. You can't help it. You are programmed that way.
Ask Questions. THAT thanks me. It shows me you are listening. It shows me that I have not wasted my time. Thanking ME takes work, and it benefits EVERYONE in the long run.