We don't have any way to accomplish what you describe automatically, and I have not heard any discussion from Development about adding such a feature, but we can take note and add your request to our wishlist.



Currently, you could just manually create a secret Cart Discount code that you could send to any VIP buyers whom you've identified from the Transaction Log as having done frequent/spendy business volumes with you.

Go to Seller Admin > View/Download Transaction Log, change the date range (defaults to show only the past month, but you can go all the way back to 2006 if you want) and View Log, then Download Log. Once you unzip the downloaded file, you can open the log in a spreadsheet program like Excel, or free alternatives like OpenOffice or Gnumeric, and sort by the Payer Email column (for frequent shoppers) or Amount (for big spenders).