One of the member posted these screen caps in a forum in China so that's how I know about it.
The market structure in China for custom video is different, mainly because of piracy issues and also hurdles in selling overseas. Basically, any videos (local and overseas), once make available for sale will have pirated copies WITH SAME QUALITY in China selling for less than US$1. The result is very little money available for the "investor" of the video. There would be more revenue from overseas sale (from people like you), but language, firewall, foreign currency control etc make it difficult for most producers to sell overseas. Only a few big ones like 2Kill4, Old Dreams, N-Max can do it.
The result is that only low cost productions would be available for sale. The high cost production is typically through group funding where the group had 20-30 people and each contribute US$30-50. If these videos are available for sale (i.e. soon be available for less than US$1), no one will join the group at the beginning. The video given to group members had different hidden water marks so if any copy leaked, they know the source and will black list that person. For established producers, you have to pay an entry fee before you can even allow to participate in group funding productions, so it is rare that these videos leaked.
Of course there is the true high end that some rich people will make video just by his own (or with just a few friends) that they don't care about the small amount form public sale. I was even told that some really rich people make their own internet movie, one version for public release and another version for their own enjoyment. This way they can get lots of high quality actress who would otherwise refuse to participate in the normal custom productions. Below is trailer of one being rumored, and there are a lot more DS/Body scene of the air hostes in the private copy.