So the idea is that they are so confident in their human capital, clientele and business processes that even with all of the code no one could potentially compete with them? Or that they want to create more competitors?
Their product is a globally-distributed monitoring system. Running these systems all over the world, and keeping them running, is a serious operational headache. It's probably at least as complex as operating the service the customer wants to monitor - perhaps a lot more, given that most services are not globally distributed.
As long as they price below "double your ops budget", they'll remain value for money - even if the code they use is free.