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It is "there" in so far as the engine is making that power (and thus under the same stress as if something else were consuming the power (the driveline for example)), but the blower is consuming the power to run (in order to make the engine capable of putting out more extra power than the SC consumes). Turbochargers take power too, but not nearly the amount of power that a supercharger takes.
If the concept is hard, just think of the supercharger in the same way you think of the alternator, AC compressor, etc. Obviously these things require power to run, as does a supercharger. It's just in the supercharger's case, it causes the engine to make more extra power than it takes to run. If somehow you were able to remove the SC, and feed the engine with air compressed exactly like the SC would, you would get far more power out of the engine. Obviously though, you can't really do this.
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