Besides, to live with an average Chinese family, a foreigner will get first-hand information about the situation of the common Chinese people's the life quality, their main expenses, and their hobbies in their spare time and so on. This first-hand information is of preliminary importance if he wants to get an insider’s view of this country.
The third reason is that it is the best way for a foreigner to confirm whether he has read or heard in his own country is true or not is to look into the average Chinese people's life in person. If a foreigner is also a well-informed person, he must be buried with bulks of information all shouting about the so-called "insider's view" about the circumstances of the life of the Chinese people in today's China; and if he is a critical reader, he should not swallow all that without even asking "is that true?"
Accordingly, I would say to the foreigner that to live with an average Chinese family will deserve all your endeavour and it is the perfect way to spend your one-day tour in China!