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It is largely something used to generate revenue but there are a couple of minuscule advantages already mentioned on this thread and one that is not.
Oxidation........in that oxidation requires the presence of oxygen or ozone to occur.
Rubber is aged by oxygen and ozone to the point that areas with high ozone levels experience rubber products such as tires, belts, and hoses experience significantly shorter lifespans.
Tires are porus and the pressurized gas inside them will seek to pass through them to reach a lower energy state (lower pressure).
If the gas passing through the tires contains no oxygen or ozone, the tires will likely last longer before suffering what people label as "dry rot".
Also, this constant outflow ensures that all but the exterior surface are never exposed to any "air" containing oxygen or ozone in addition to the previously mentioned lack of moisture.
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