Speaking for MAG in my area, we have a lot of local, low level meets that aren't sanctioned. Our gym doesn't require the boys to join USAG until L5, but they do compete starting at L4. They try to keep the pressure low at the beginning, so that more boys are willing to even try it. For my DS, he competed no sanctioned L4 meets, about half and half at L5, and now at L6, they all are except for one casual sort of practice meet. The judges at the nonsanctioned meets seem to typically be other coaches, or have even been high level boys team, whereas the sanctioned meets have more official judges. I think it's just easier to put the casual meet together that way, and not totally scare off the new kids!