Oh, another thing that I forgot to mention is that even if you're in front of a decision maker or economic buyer, there's a good chance you're talking about stuff that they don't care about or can't evaluate, anyway. A director of software development, 10 years removed from the keyboard, will have no way to evaluate whether your "The Pitfalls and Joys of Closures" talk should give you the inside track for a position, assuming he or she attends such a talk.
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Oh, another thing that I forgot to mention is that even if you're in front of a decision maker or economic buyer, there's a good chance you're talking about stuff that they don't care about or can't evaluate, anyway. A director of software development, 10 years removed from the keyboard, will have no way to evaluate whether your "The Pitfalls and Joys of Closures" talk should give you the inside track for a position, assuming he or she attends such a talk.