Well, as one of the Chrono guys at the Ohio Sectional I can tell you we were sad for the 3 people who went sub-minor at the match. From my prior experiences as "a chrono guy", the people shooting Remington UMC ammo alway have problems. Add a short barrel gun and several other brands can be added to the list.
My 2 cents is along the lines of Aztecdriver's, a person should be prepared for the level of match they plan to shoot. I went minor my first Level II because I didn't have a chrono (I was shooting limited with a Glock 35).
Ranger - The rules are there to make sure everyone, everywhere has the same playing field. The new folks that like the Level I matches and plan to shoot a Level II or III match should get their gun/ammo combo checked before the match, they owe it to themselves.