Thames flood barrier was used in anger on 95 occasions between 1982 and January 2007
And how many days has it snowed over the same period? My memory doesn’t go as far back as 1982, but certainly in the last 10 years or so it’s been very little.
As another poster pointed out, the issue is one of “opportunity cost”. Given that money is not unlimited, then what is the best use of it? Spending more on snow equipment for those few days every 10 years or so or more security, better ATC to get the aircraft up/down quicker etc. This debate is getting a bit silly, because people are assuming that money is endless, when in reality it is not. If you must argue that there should be snow equipment, then state that you are prepared to pay more for having this privelege, or that you are happy to trade off longer security queues or what ever you think should be traded off.