Spare motors for Vision +

Now for the newbs, why do we need spares? Aren't these things supposed to last forever?
 
From what I can tell the motors don't really wear out.
The bearings in the motors do wear out.

When that happens you can either replace the motor, or replace the bearings. As I understand it, there are better bearings on the market that are more efficient, and last longer.

When a bearing goes bad it is obvious, and loud. (So I am told)
 

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