In Catalonia, Europe, with a population of 7,5 millions, most secondary public schools use Linkat, a Linux distro based on Debian/Ubuntu:
http://linkat.xtec.cat/portal/index.php
That means there are thousands of children using Linux ;-)
And there are some other countries in Spain with their own scholar Linux distro.
I don't think so... Maintain a server is not payed with 60$ yearly ;-)