personally i would keep distance from that "朋友"....
我本人對這樣的方法持反對態度,這麼做明擺著商家吃虧。
well, it was nice of you to think that way. but i think you missed the most important part: you gotta have moral bottom line. you don't have to be saint, but at least have bottom line, especially you are an example for your daughter...