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To be fair, as long as you're the only one in your company doing it, it's reasonably secure, as soon as it becomes company policy, all your passwords fall within regular cracking procedures, and are likely easier to crack.
Society rewards results. Definitely. So getting excellent results is important. But, parents and teachers aren't necessarily there to evaluate results. They're there to teach Johnny how to get them. Rewarding hard work, and continued effort is one important way to get those results, and it hasn't been focused on. Instead, we tell him that it's alright that he didn't get the right answer, and he should stop trying so hard and come have a cookie so he doesn't lower his self-esteem. This has the opposite effect, he doesn't get the results, and he fails to learn about work ethic.