The son-in-law and richman were comparing orange to apple. If you have pricing power, son-in-law is right. This is ideal case. If you don't, then richman is right. This is your base line. In reality, if you are not sure, you probably would be very happy to settle in between.
China is much more open to the west world now. Even small fish in US have access to Chinese manufacturer directly through Alibaba, or trade EXPO at GuangZhou, etc. Very few importer, if there is any at all, will pay 1000% margin to middleman like son-in-law. How can you survive if you buy from son-in-law while 99% of your competitors buy from richman?
It is a different story if you have a proprietary product. Unfortunately most Chinese manufacturers don't, and most middleman don't.
The discussion is great. Even if you are in doubt, it is beneficial to hear argument from both parties. I am looking forward to hearing how son-in-law can get pricing power.