I am so not getting into this, as its akin to inviting the puncture fairy's family over for tea, but I've got 6500+ miles on the SMGTe's chain, and 4000+ on the KMC lightweight.
Given the hell I've put them through (year round commutes, 850 miles with a missing idler, etc...) I guess I'm overdue a snap. My mind says "the chain only really wears where its being wrapped around a tight radius or manhandled by the derailleur, so although I'm running 3 chains on each, only one of each is being worn at any time. Thus each chain has really only done 1500-2500 miles."
I know... I know... My mind won't be so clever when I'm walking the bent home next week.