Maybe you have hit the nail on the head.
The Chinese love their money more than their Mother.
Hence defecating free of charge would be the burning desire and not the national shame that it would cause.
I am not too sure if this would also come in the 100 years of National Shame in the Chinese scheme of things.
Great sanitary habits of the Chinese.
They are ever so 'civilised' or are they environmentalists who want to conserve water?
I was once talking to a Hong Kong Chinese and its worth hearing what they think about their mainland/PRC counterparts. These hygiene habits are always talked about along with their show off nature.
I also remember a personal incident, I once saw an Asian family(2 kids ,mother and father) at a Subway outlet in India, when they were done eating, they jsut wiped their hands and left the trays and all the coverings lying around on the table. I immediately deduced "They have got to be from the PRC, I have yet to see someone from Japan,HK to be so indisciplined".
Another great thing I remember was a thread on some Chinese forum where the topic of discussion was to post pictures of expensive stuff people have. It started from expensive watches to imported cars to lot of land certificates, rather I'll post all those pictures here.
->This is a Coal miners permit.
->This is a man having 150 million USD in his account.
->These are all land ownership certificates.
->Finally this fellow won the discussion by showing an invitation to one of the CPC's most important events.