This is an honest to goodness question. I'm not trying start an argument about the playing abilities of either player...
Neither Briscoe nor Humphries looks to be drafted. What could a player of their caliber honestly expect to make in the D league or overseas? (I'm assuming that's their only option)
Call me crazy, but I would rather be treated like a king as a junior at Kentucky with all my living expenses paid than play in empty arenas making 50k. In all reality, playing for UK will be the pinnacle of their careers. Why would you not choose to extend that pinnacle a little longer? Instead they will go into basketball obscurity.
I could be wrong, but I don't think D-league even make 50K, I thought it was closer to 30-40K. That will pay the bills, but that's it. I think they can make more overseas, I don't know how much more, but I'm guessing 6-figures. But that may be a longer path to their ultimate goal (NBA).
Sure it is the fantasy of every UK fan to play in Rupp in front of 24K fans. That is not the fantasy of most 20 yr olds not growing up in KY. They dream of playing in the NBA. Now if playing at UK helps them reach that goal, then (the smart ones) they are all-in on playing for UK. But the part that could be a factor (I think it was for Briscoe) is that to play at UK (unlike at UNC) you have to go to classes and write papers and take tests and maintain your GPA. And some kids have NO interest in the academic side of college sports. That's ok, it's not for everyone.
Would I have liked to have had Humphries & Briscoe back next year? Yes!
Do I begrudge them? No.
Briscoe is what he is. He's a good player, who won't ever be great, but he probably only has one area that he likely can improve in and that is shooting. A pretty big area! His shot looks very mechanical & stiff. Maybe he thinks the time he had to use in going to classes and studying, he can instead use that time working on his shot. He can defend, he can get to the hole, and even without a huge vertical he can finish, he can handle the ball pass it, he can even get some rebounds. Just become an adequate shooter, and he can probably make an NBA roster. I see him very much like Andrew Harrison.
Humphries just isn't the style of player that plays a lot for Cal. I think it is because he lacks quickness and isn't a good defender. But he is 7'1, he rebounds well, and he can make jumpers. He's not super slow. He's also young enough that teams will think they can mold him (at his age Will Purdue, who had a long NBA career, was even less productive than Hump playing at mediocre Vandy). I really can see a playoff team with not much roster room drafting him and stashing him in the D-league hoping in 2-3 years they have a productive backup 7'1 Center. 6'8 & under athletes are a-dime-a-dozen.