Total spend on public primary and secondary education in the US in 2016/17 estimated at $584B.  3.1 million teachers.  So $25K award to top 10% would be $7.75B.  An award to top 5% would be $3.875B.  Would probably look great, but wouldn't be cheap.

http://nces.ed.gov/fastfacts/display.asp?id=372