Well if it is an 8 percent increase in traing spread out among all the skills of you trainee than in 5 seasons you are looking at an extra 40% of training so it seems like it would pay off in the long run if you can find a cheap superior trainer like I did (20k salary per week). That is of purse only the case if you are training your player until they are 23+.
Murray/Harris/MPJ/Grant/Jokic - 2020 NBA Champs