We get a few calls from these wonderful people each month. I try to keep them on the line as long as possible. It's great fun to play stupid and pretend that you're in front of your computer doing as they've requested yet not getting the results they want. I find they lose patience quite quickly and hang up quite angrily.
Seriously though, they got the lady down the street from us for $300 for a two year contract. She followed all of their steps and gave them access to her machine. They "removed some threats/problems from her computer" and said that they would continue to monitor and check her computer for the next two years.
Do a quick online search and you'll find plenty of info about these fine folks.