Pro Sites export user CSV for levels

Hi guys,
Feature request here.

Having an option to export a CSV of users for each pro sites level would be AWESOME!
This would allow us to target marketing campaigns to certain levels (free, 1, 2, 3 etc.)

This means that we could increase profits and decreased wasted emails. There's no use sending out an 'upgrade now' email to users on the most expensive plans.

Cheers guys