Highschool Baseball Tournament Photography

Professional photog working mainly in portraiture, events, and interiors, and recently had a client mention shooting local showcase baseball tournaments they help organize. What is the money like in this?

I'll need to talk to them again because it was unclear if they were wanting to hire me to do publicity (in which case I would just charge my hourly) or if they were offering access thinking my sales to players and parents would be worth it enough to let them have publicity for free, or they would purchase photos for publicity as well. Does that even exist?

My immediate thought was culling, light edits, and sell 4x6" or social media-sized digitals to teams and parents on something like SmugMug—maybe $5 per(?), but I'm also thinking the novelty will wear off pretty quickly. I'm not trying to do it full-time or in any way that's stable, just trying to get an idea of what it might be worth. If I could make $100 per game, that might be alright.

Also, what's the image permissions like on something like this? With kids? I'm assuming it would require a waiver of some sort signed by each team before entering the tournament. Would I need to have my owned signed to sell images back to their subjects?