Based on their observation, Gu Ruoyun had chosen the Door of Life because she had been intimidated by Tianfa. Hence, she had made her choice out of fear.
However, most of them also know that places which look the safest will usually turn out to contain more dangers. In contrast, the Door to Death would be the way to more precious treasures.
Hence, it should be a safer path than the Door of Life.
As such, aside from the Murong family, the rest of the organizations, including the Three Great Authorities, chose the Door to Death.
While Mo Liyou and the rest have taken notice of Gu Ruoyun thanks to the previous events, they were not willing to put their lives in danger. To them, their choices which were based on past experience would be better.
...
The Door of Life was a truly appropriate name.
No treasure? Well... Duh... *rolls eyes*