I send and receive notes to/from those with whom I have business or personal relationships. Its something thats done in certain circles.
I have found that clear expectations up front has helped to establish some great relationships while enhanced expectations usually follow excellent transactions be they any size of one to one purchase. I've never shopped for Persian rugs although I certainly wouldn't rule it out in the unlikely event the Persians somehow begin to weave rugs to an aesthetic standard that would fit our decor.
In the old economy, the dealer/retailer had to get on bended knee to earn the business...but they were only competing with others in the same business. With the advent of online sales, there are so many more options for the consumer that the local dealer/retailer must prequalify the potential client. This is one way.