1. It's difficult to play without least a couple midfielders, a goalie, and some defenders
3. Everyone needs at least a lacrosse stick, and a ball (although lacrosse balls are small and easy to lose, so it's better to have a few on hand)
4. Same
It's also one of the most expensive sports to play, and few schools (high schools at least) subsidize it like they do with American Football.
http://sitekite.com/test-V2IjEA