A LOT of offroad riders and dualsport riders don't lube their chain due to 1. like Tsmall said, the lube is already there and 2. the lube just make dirt and grime stick to the chain wearing it out faster.
I've had two chains on the DRZ in 21000 miles and I cleaned/lubed them once a week.
a fellow DRZ rider down here only rides off road but has about 10000 on his chain never lubed... just cleaned...
YMMV
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