Is it reliable to travel to Yunnan for 400 yuan?

I have an appointment with my friends to go out to play. They say that traveling in Yunnan is very cheap now, and travel agencies engage in activities. Because I didn't know much about the situation at that time, I just thought it was really cost-effective to sign up for a group tour in Yunnan. It was too cheap, only a few hundred dollars. At that time, the doubts were only round-trip air tickets, plus five or six days of three-star accommodation, three meals a day, as well as fares from all over the country and tickets for various scenic spots. How could it be hundreds of dollars? At that time, I asked them when I signed up at the travel agency, saying that I would have to make shopping compulsory. The travel agency lied to us at that time and said, no, the money is in your own pockets. You can make your own decisions without shopping when you get to the store. In this way, our group signed up, and as a result, there were countless pits. . .