Our rule used to be "7th and 8th graders can cheer varsity as long as they share a campus." 5th graders were also allowed to cheer middle school if they "shared a campus." I found the rule to be there mostly to help the small k-12 or private schools. Around here those have been the only ones I've seen that utilize it. That may be why I don't have strong feelings against it. Our school and the lower one technically share a campus, so we tried to do this once. Our AD wouldn't allow it. I personally don't see an issue with it.
Where I do have an issue though, is that I've been told the new rule is not if they share a campus, but if they are all under the same board of education. THAT changes things majorly. I'm going to be doing some digging to find out if this is rumor or fact. This essentially means I can legally take the best kids from my school and the best kids from the other 3 high schools in the county to make one competitive powerhouse. Legal, because we're all under the same BOE. Our other high schools aren't competitive, so we offer a sport/activity they don't. Essentially an allstar like team, getting to chose the best kids within the entire county and take them to UCA, where other schools only have the kids in their building to chose from. I'm hoping that the talk I'm hearing is just being blown out of proportion and is not actually the case.