Originally Posted by Chinatrvl

Since the highest surchage is, in my experience, on full fare F tickets (on some routes over 1000 CNY!) and also notable on full Y/W, I highly doubt that. Furthmore, it's also possible to compare booking classes of discounted tickets - you'll also see it's more expensive than on the airline's site.

It's a mark up or simply a fee that isn't explicitly mentioned like it is common at European online flight reservation sites.