Most of TCM does not go through any scientific analysis to see if there are any positive or negative effects. The entire system is derrived from unsubstantiated, anecdotal "information" that was supposedly passed from generation to generation. In fact, now, most Chinese choose to use Western medicine because they can actually see results. It can also be said that many of the people that use TCM are the ones that cannot readily afford how expensive Western medicine is here. With TCM, the patient is told to drink some sort of tea (a lot of water with fresh ginger added and all kinds of random debris such as bone), get lots of rest, and eat a lot of vegetables...when you go to the doctor in the west, what does he tell you? He says, drink lots of fluids, get a lot of rest, and eat well.
There are too many variables to account for to be able to actually get a good study from this. You also have to consider the incubation period of certain illnesses and the normal course of the illness; usually the last variable is the killer. The common cold lasts for 5-7 days. Many Chinese doctors say that they have the cure to the common cold...they tell you to drink the tea for 5-7 days. See a problem with this logic?
I recommend you guys check out this website; it has all kinds of stuff about medical quackery and has some articles on Chinese medicine.
Anyway, as for the pu'er medical debate, in HK they sell pu'er in the medicine shops (Eastern and Western) to cure stomach ailments, and as an aid to help lose weight. Finding scientific studies, especially in China, on this will probably be just as difficult as finding some studies that prove that drinking the dung of some rare animal will cure impotency. All I know, through my observations, is that it makes my stomach feel damn fine after drinking it, and that's good enough for me. heh.
It ain't for the money, it's for safety; well, could be a little for the money. Many people, such as people with some sort of incurable disease, would easily buy into some sort of magical, mystical Eastern cure.