The service has blocked 1,350,297 attacks from 138,184 ip addresses.

With single site methods the hackers get to attack every new site they target with the same bots, and each site has to build up their own individual block lists.

With Brute Protect once a bot is blocked from one site, it's blocked from all sites using the service.

With each additional wordpress installation using the service, it becomes harder and harder for the botnets to be able to attack new sites.

Is this the only step you should take to protect your wordpress installations, no of course not; but it is certainly one of the first.