From my random perusal of the various reports of compromises over the last few years, my impression is not that organisations tend to get hacked using the latest zero-day vulnerability, but rather that organisations get hacked because they have glaring security holes that you could drive a double-decker bus through.

For example, bcrypt has been around for how long now? And don't almost all the reports of hacks report that a database was lifted with usernames and passwords either in plaintext (for the love of all that is holy) or hashed with unsalted SHA1, or similar?