Central Station Monitoring Agents Get Paid Per Call?

In a interview with a Vivint employee, she mentions:

We pay per call, based on their performance. So based on whatever their performance is, we’ll give them a threshold and then they get paid per piece of work that they’ve done, and that’s paid out bi-weekly.

Can anyone elaborate on this practice? How it works? How common it is? The pros and cons of it, etc.?

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