Some High School activities are already pay-to-play, such as Marching Band (over $1000 per person this year). Much of that is offset by fund-raisers, but they are in continuous fund-raiser mode (Cheese, Candy, discount cards, candles, pizza, car washes, auctions, run the concession stands at baseball/basketball/JV sports, etc. ).
Then to compete in the Winter Guard (aka flags/rifles) competitions it is another $400 - $600 per kid.
The trend has been more $$$s required from parents, kids, and fund-raisers every year.