As someone who is running a club, field space costs money but you can mitigate the cost by having two team use one field and split the cost. To maximize profits a club would need an even number of teams and as many "Volunteer" dad coaches as possible. If you charge $1500 per kid with 20 kids, run the HOCO league, 5 middle school summer tournaments, two practices a week, make each person pay for their own US lacrosse membership, give a decent uniform package with socks, have off season training indoors, you can make anywhere from $5k to $8K per team. You will have one time fees for Incorporating and tax structuring. Ein numbers can be obtained through the IRS at no cost. Management time still comes into play as you will be chasing people for money (huge headache), players will leave, and you will need to back fill spots as little johnies is not getting any playing time or getting any better. A good club owner will attend all the tournaments and mingle with the parents, clients, to maintain persistency with player returning. Finally, coaches sons will play for the cost of the uniform or free. Can be a nice side job.