Greg, do we really want to start this discussion up here? Are you going to tell them the rental costs and setup time for a decent stadium system or shall I? When you and I look at this issue on a competition weekend, we see a high school stadium, and each junior corps rolling in a small, usually decent quality speaker cluster onto either 40, sometimes with a subwoofer. And then when we go to work on Monday we see a 5,000 seat theatre with two 20 cabinet line arrays that several pros spent several days tuning and programming to even out response in the venue.
I see the "experts" propound their theories about amplification here on DCP and cringe. Someday you and I have raise this with Pat Baltzell and Mikael Stewart (house sound for literally dozens of Oscars, Emmys, and Superbowl broadcasts) and try to describe just what it is that competitive DCI drum corps are doing with amplification in everything from 500 seat bleachers to 50,000 seat stadia. Should be good for a laugh.
You know this as well as I do. In entertainment everyone has two jobs. Their own, and audio.
(By the way, Greg is a big deal theatre and theme park installation sound guru. And he's a really great Caption Head too.)