This one led to some of the most interesting things about abuse - getting surprising new domain names! When someone bought a domain with a stolen credit card, there was usually no way for us to cancel the registration (eventually we could if we caught it fast enough, but by the time there was a chargeback it'd for sure be too late).
So, we figured - we paid for these, I guess they're ours now! I don't remember any specifics, but there was definitely some weird ones in there.
5/?