Use a salary estimator like on (http://www.buzzer-manager.com/)
For your example, a player with all 10's going from 10 to 11 in JS: 19k to 23k
For your example, a player with all 10's (except JS) going from 15 to 16 in JS: 43k to 50k
Play around with it to estimate salaries after training and also where to get free pops.
Hm... okey my friend, thank you:)