brotherhood_of_LAN - 10:16 pm on Nov 4, 2013 (gmt 0)
What overkill? That's just an isolated example coming from a class C using the same UA.
How about several hundred ranges, random UAs and 'polite' scraping via a browser... you wouldn't notice.
I guess it depends on how important you feel it is to ban non-human non-useful visitors.