I'm kind of a broken record on this but for some it is how much you enjoy college life and all that goes with it. Do you like or not hate at least going to classes? Do you love college basketball and the BT tourney and NCAA's. What is a senior season with your teammates worth and in Liver's case, being a star on a contending team worth?
A guy who was an absolute top tier NBA prospect, Tim Duncan, weighed that and went back for his senior season and he would have been a top choice as a junior.
Livers is not on the NBA radar to be drafted (if we can believe all of the "expert" projections). Does being paid to play in Europe appeal? In this age of turmoil over there, troubled governments, terrorism, and now the coronavirus, I would think Europe is a lot more dicey.
I think Cassius Winston looked at all of this last year, he was not likely to be a first rounder last year and maybe not a second rounder. He isn't this year either but he got another chance to be a star in college basketball one more time.