What is the size of the Soccer Tournament Market in the USA?

I'm interested in any information regarding the number of Soccer
Tournaments, Participants - teams and players, Team Fees, Revenue
Generated - Sources and Amounts , Staffing (staff to volunteer ratio).
 Groupings by any naturally occuring segments (Adult/Youth,
Select/Recreation, etc.) are appreciated.

This is a "first cut" request that I expect will spawn more specific
questions after review of the material.



Let me know what you can find on an inital search