Couple giftcards.com data points to share:
1. The BFVIP code seems to actually be 5% off, not $5 off $100
2. It seems to be tracking fine through cartera.
3. I did get an error message eventually of "You have already met your spending limit on virtual gifts for the day". New to me. Not sure if it is a new limit or I just never bought enough before to trigger it.