Thanks Localzuk. you are right, in some ways. maybe with small projectors, which are becoming less of a maintenance issue with the LED range, no filters to clean or lamps to change. but then you have the "show" projectors that are around the 5000 Ansi lumens range that are used in the large lecture theatres and such. these need a little bit more care and attention. preventive maintenance too, just to keep them in tip top.
apart from all the printers, desktops and anything that has a computer built in, we are responsible for over 130 teaching rooms, all with a projector, amp, speakers, switchers, control panel etc. so a dedicated team is a must in this type of environment. maybe not for a primary school for instance.
as an installer, i used to install many of the same type of kit into each classroom. smartboard, projector, speakers etc and they are more reliant on this type of technology to keep the class educated.
most schools had service contracts with A/V companies to keep them all running. but the money is tight for stuff like this. Education projectors now days come with a 3-5 year on-site swap out.