Read several yrs ago that only 15% of second round picks make it. Not sure if still true but it seems like there are a few elite players and a lot of very good ones that turn over very frequently. Have often thought it is why college basketball is so competitive and rankings between 50-150 don’t mean a lot as the differences are often lost in the system they are playing in as well as the coaching.
Don't think that's even close to correct.
"Of the 132 college players selected in the second round of the last six NBA drafts, 91 of them — or 68.9 percent — received at least a one-year guaranteed NBA contract, meaning they had at least one season where they made the NBA’s minimum salary. This past season, the NBA minimum for a rookie was $815,615, a number that will continue to rise as the NBA’s salary cap rises. "