It's true that website hacking remains a big issue in the spammiest areas of the web even though it's completely illegal. Unfortunately, there's a lot of unmaintained, unpatched web servers out there that blackhats exploit. It's fundamentally a hard problem, but we've been working on the next generation of our hacking detection algorithms.
I've always wondered why we don't see more startups offering hacker protection, detection, clean-up, etc. Companies like McAfee made a lot of money protecting personal computers, and there's a similar opportunity on the web server side.