Fantasy westward journey out of the picture problem?

According to my experience, it is not only related to the probability, but also to the number of people who draw a picture in this time period. Drawing a picture is very profitable, and the probability of equipment is not bad. In order to stabilize the price in the game, dreams must limit the probability of treasure. At the same time, the number of pictures will not exceed a certain number, so when many people draw, it is recommended that the landlord not follow suit. I usually draw pictures all night, and it is better in the morning.