The benefits to open a Hong Kong company dealing with all trade matters since it is free tax in Hong Kong, also English is also the official language beside Chinese no matter from law and regulations, the money in and out of the Hong Kong SAR (Special Administrative Region) which is easier with many well established international banks in one city.
When you host your website in Hong Kong server, it is easily to be communicated among China and the rest of the world. It is not only Hong Kong has the best Internet exchange bandwidth to many countries, but also many China Chinese using Hong Kong as the stepping stones to go out of the world market doing World Trade business.