My school district had macs since before I got into jr high.  The elementary schools stayed on Apple IIs, but the Jr high and HS has always had a policy of "needing" the latest models, and they usually choose models that are over priced for what they offer.  Always macs though.  When I got there, they had some LCs that were just about at the "end" of their "useful life.  They upgraded their systems 3-4 times from my 7th to 12 grade years, and as far as I can tell, they are continuing to follow that kind of mentality.
Then they wonder why voters keep voting "no" on the new school bond referendums they push out every 1-2 years.  Well, actually, they don't wonder, they very loudly and publicly whine to high heaven about it.