matrix_jan - 3:06 am on Feb 9, 2013 (gmt 0)
Make your email even more strongly (yet vaguely) worded to capture more of the second third:
"As you may know, once your site receives enough disavow reports, Google might penalize it. It's important you verify your site with us to prevent us from filing a report with Google."
It's called blackmailing. Pay me or else I will disavow. Talk to google first about monetizing their tool :)