I think it's a great idea and I'd definitely choose to pay with btc. That said, I doubt you and I are typical customers as most are still unfamiliar with digital currencies and don't fully trust them. But like you said, it cuts out the PayPal fee so it seems like a no brainer to at least have it as an option. The main problem, I think, is the legality of Bitcoin in China is kinda unclear. I've read up on it a bit, and from my understanding, for all intents and purposes btc is illegal in China. So.. that kinda puts a snag in the plan considering most of the sellers are in China. I'm pretty sure it'd have to be a seller located outside of China in order to offer this.