There are quite a few reasons. Dimming alone greatly reduces energy consumption
and may pay for itself through energy savings not to mention extending
bulb life 10 times or more.
Lighting systems that combine occupant sensing can also turn lights on as someone enters a room and then off
when they leave saving energy from leaving lights on when not needed.
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Yes, a 3 way dimmer will replace one of the 3 way switches. A 4 way
circuit can be dimmed from all switch locations by using a
Multi-Location dimmer and 2 Accessory Dimmers such as Maestro, Spacer,
Spacer System or Faedra.