As we’ve covered before, SIEMs are an expensive tool. The average enterprise-level SIEM deployment costs over £15 million a year, and operating a small, 100 to 1000-seat SIEM will still run up bills of over £10k monthly. SIEMs create spiralling costs that eat security budgets. Without a skilled team operating them, they can also make organisations less secure despite receiving more information about their digital estates. But where do these SIEM costs come from?