Back in my Michigan club days I would do additional money outside of club practices for additional income. I would invite EVERY SINGLE PLAYER on my rosters for the opportunity. I'm hearing of club coaches doing invite only additional training of players that are on their teams. I have a big issue with this. This is creating a toxic environment of the haves and have nots. If the players that were invited get more playing time than the players that weren't invited, how do you think that looks?
Also, I've known clubs that prevent coaches from doing outside training all together. This is also a problem. Put your staff above the ego of the club.