Traveling costs have also skyrocketed over the past few years (mike beat me to this one, heh. :P). Perhaps that has something to do with increasing ticket prices, though prices always have and always will go up. Anyway, this is all pure speculation is my point. If they're losing so much money due to yours and others' dissatisfaction, they'll have to change a lot more than ticket prices.
And, like I said earlier, we're in the first couple of years of corps using equipment that the petition signing crowd protested. Even the most vehement of the Cadets/Hopkins haters who signed that petition (or didn't, or couldn't) might just find enough merit in DCI shows to stick around. It'll take some time to figure it all out one way or the other, I should think. What you guys are offering is speculation...I'im just doing the same here. And I couldn't care less if DCI got rid of amps etc.