The liability thing would be a killer, especially in this state (NJ) with its superabundance of lawyer types.
A couple years ago I thought about renting out a couple rowboats on my lake for fishing... with outboards.
I couldn't find an insurance company that would even write that kind of a policy, let alone tell me why it would cost too much to be profitable (for me).
Whatever happened to personal responsibility?
Maybe legal preeminence and jury nullification!
At least friends can still help each other out.