Another example expanding on my previous comment.

This IP from Hongkong Hit my site over 5,000 times in a couple minutes. The first 12 page loads were legitimate URLs and got served. On their first exploit attempt, they were blocked and the remaining 4,98x page loads were no-effort 403s. This type of thing has made it possible for me to have a cheap public-facing site as I wouldn’t be able to afford an endless array of malicious IPs doing this day in and day out. Before I went this route, I would have to shut the site down during high impact periods of these visitors as they’d corrupt and crash the database.

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