I'm not real sure why this person gave up, I'm sure they could have let their random password generator run longer. A few times they made 8 attempts per second on my system.
I know, there are plenty of things I can do to prevent this from happening in the future. I could also take the futile action of reporting them to their ISP. Instead I will just leave things as they are and keep laughing at them. I don't have nearly enough bandwidth for them to crash my server with too many requests, and my logs auto rotate in such a way that they can't fill up my hard drives with logs of their attempts either (although it might be time to increase the turnover cutoff by another factor of 10).