The question is when do you think they will get some use
But only a few years back in 2009 & 2010 we had quite a lot of snow. I don't think MAN would have won many accolades then had we not had reasonably decent equipment. It's just so unpredictable.
Regarding de-icing equipment and that used for aircraft rather than runways and taxiways: Although it's apparently the responsibility of the handling agents/flight operators for de-icing the a/c, is the equipment owned by the airport? If so, presumably it's also their job to maintain it and ensure the rigs are all serviceable. If not, I guess it's quite an expense for the handling agent.