We do all our Varsity games here in MT with 3-man. In some of the tiny gyms it is almost too many people out there but we do it anyway.
Last year I was doing a JV game in 2-man. The H coach was asking me to watch off ball screens so I said "I'll watch what I can and that is why we have 3 refs at the varsity level to catch that stuff easier". He looks at me and says "all having 3 refs does is make you all lazy. You had 2 refs for all those years and were just fine, now you all are lazy"
I swear...