I think some people aren't understanding that LadyJaiven didn't say for every sale but for people who leave feedback. Sending a thank you for a sale is nice, but I can see where it would get very overwhelming for some products. But if someone purchased from you and took the time to leave feedback also, which can help other sales, it is nice to get a thank you. People like to be appreciated, it makes them feel good. When they feel good, it builds good customer relations... and it can make a big difference.