What if Harkless goes pro, gets drafted in the second round, and cut several months later? His game isn't much different than Hakim Warrick IMOP. That guy stayed 3 years in college. He proved beyond any doubt that he was a first round pick.
And ya know what, he wasn't coming from a wealthy family where he could afford to. These people who are telling him to go take the money are fools or conniving thieves who clearly don't have his best interests at heart.
If you care about Harkless help him make a choice that's right for him. Leaving in no manor shape or form before you're ready will be a disaster. He won the BE ROY, but let's not forget that in at least half our games he overmatched by a stronger more experienced player.
Work on your game Moe. You'll get there, but slow down, and do it the right way.