If it was a first time customer, I'd think he didn't know what he wanted, but when it's the third or fourth order you know what he's really saying - "I trust your judgment."
When you first start writing for clients, there's always that worry... you send out an article and halfway expect the client to come back and say "WTF is this, you idiot" because you screwed something up. The moments of confidence and trust are always unexpected, and just worth their weight in gold.
A lot of people out there praise their outsource talent, whether it's content writers or web designers or just plain old affiliates, but I think sometimes the outsource talent forgets to come in and thank the clients. The street runs both ways, and if I didn't have so many great clients, my life wouldn't be as good as it is.
Just like the web designers wouldn't be much of anywhere without people who needed sites built, and the affiliates wouldn't be much of anywhere without people who needed products sold... we content writers wouldn't have much of a business at all if it weren't for the clients.