Oh, I agree 100%.

Thank yous always go down well, especially if they're sincere.

Last year I bought some pens and ink from Goulet Pens and not only was the package so well-wrapped it was a challenge to unpack it, but there was hand-written note along with it, thanking me for the purchase and hoping that I'd enjoy the pens and ink. (And it was written in an ink colour I don't own, which of course, made me put it on my "I want list")