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I think the main contributing factor is water; there's always more water on the n/s due to the guttering of our roads. Alloy rims don't rust, but they do oxidise; forcing the tyre away from the rim so air can escape.
I can only imagine that with the drive and 70% of the braking using the front wheels they are generally hotter and therefore dry sooner than the rears.
Wadda you reckon?
P.S. I've always found aftermarket rims more susceptible to slow punctures; but it is also well worth checking for nails in your tyres too.