Originally Posted by
mooper
This discussion, and similar ones that have come before it, are moot unless you both have access to a card(s) that will accept dozens of charges per day,[snip]
That's exactly right. It is not too difficult to trip the fraud filters. I recall round-up match BOA card promo where people were placing lots of small transactions to try to get the rounding difference match (pocket the change or something like that, I forget what it was called exactly). More than one story of getting a call from BOA or getting the card suspended.