How to Separate Paying Customers from Non-paying Registered visitors?

Hey guys,

Under Users > Customers I am trying to find a way to separate out paying customers from people who just come and register (But DONT make a purchase) so I can create a mailing list and send a promotional Gift Certificate to those non-purchasing (but registered) visitors to get them into my store.

My cart just lumps EVERYBODY who registers (even if they dont buy anything) as a customer.

I cant seem to figure it out and I couldnt find anything in the KB.

Any ideas how I can generate a list of my non-purchasing registered visitors?

Thanks! :wink: