Why would a component have a low input impedance?

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I have noticed that some units have input impedances of 10K or lower. If you have to parallel these units, for example, through a tape loop or using main and sub amps, the input impedance can drop in half to 5K, making for a very difficult load for the source, even a high quality one.
Why don't all units have input impedances of 47K or more to present an easier load for the source? What is the disadvantage of a high input impedance? Thanks.

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Topic - Why would a component have a low input impedance? - GGA 09:01:29 02/14/07 (1)

Re: Why would a component have a low input impedance? - Ole Lund Christensen 09:41:52 02/14/07 (0)

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