Having done my time in the tech support trenches, I do one hell of an "end user" impersonation. I held one of these guys on the line for 1 hour 20 minutes one evening, then told him my phone was dying and that I'd need to call him back. I called back two days later and tied him up for another 20 minutes before he finally cracked and hung up on me.

Yes, it was a terrific waste of time, but boy did it feel good. I consider it volunteering. All the time I spent on the phone with the scammer was time they couldn't spend targeting vulnerable individuals.