We were booted from stripe when a couple of customers just decided to chargeback all of their previous transactions, each of which was pretty small, without first contacting us, so it was too late to issue refunds. That pushed our chargeback rate over the 2% threshold, so we were booted. Unfortunately the chargeback rate is measured as % of transactions and not volume. Seems like a great way to screw with a competitor would be to get a few cards with different names (on one of my cards alone I can assign up to 100 authorized users with new names and addresses), make a bunch of small transactions, charge them back a couple months later, then watch your competition get booted from stripe.