Okay, but what is the point of being on TV at that point if the ultimate goal is to be trained to the point of making the NBA? The point of TV used to be exposure for players, but if you are literally in the NBA's dev system, you already have that exposure. The only advantage anymore is that the TV exposure can help them build a public name for themselves which may net sponsor deals in the future. On the other hand, G Leaguers get paid (albeit not much) legally, which is a plus in that column.
It's not a no-brainer.