Its a matter of efficiency. Basically, AC can be sent over a wire with higher voltage, and therefore less current (P = IV). With less current, you have less resistance, and therefore less power loss due to heat.
Over short distances, this may not matter much, but even if you had DC power, you would need DC to AC power adaptors for all those devices that work better with AC.
Either way, I dont believe that people would care to spend five minutes deciding which outlet on the wall to plug into.
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WHAT?
This is an old discussion:
http://en.wikipedia.org/wiki/War_of_Currents
Its a matter of efficiency. Basically, AC can be sent over a wire with higher voltage, and therefore less current (P = IV). With less current, you have less resistance, and therefore less power loss due to heat.
Over short distances, this may not matter much, but even if you had DC power, you would need DC to AC power adaptors for all those devices that work better with AC.
Either way, I dont believe that people would care to spend five minutes deciding which outlet on the wall to plug into.