I don't understand. "Return For A Refund" because he didn't like the price he paid for it?
My guess, he saw some of the prices PSA 10's go for on occasion and thought the SGC 10 would translate similarly.
Most likely a gamble that lost, and he probably had no idea what it sold for previously. Plenty of gamblers are driven harder by the idea of the gamble then they are in researching the gamble itself. If not, bookees and casinos would be out of business fast, if people actually did a pro and con analysis of their odds of winning the "gamble".