2 tourneys (one travel, one local) - $3,500 entrance fees
8 games vs local teams - Ref fees - $400 (we pay one ref, opponent pays the other)
1 paid coach - $10,000 ?? (2 dad coaches are assistants for free)
Uniforms - $600 ??
Rent practice space - ??? (not a lot of money if rent from a school or town park

Divide by 18 kids (20+ too many) = $805 plus 1/18th whatever it costs to rent practice space per kid.