Experts tread on Web-based sneaker trade

Some rip booming industry that they say uses shady tactics to net big bucks

Zhang Xinyu has been in the sneaker business for seven years. Calling himself a sneaker aficionado, he is not only enthusiastic about buying sports shoes on the secondary market, but is also keen on selling them.

"I do this because I love it," Zhang said. "Also, I can get those limited-edition sneakers for low prices through special channels.