From what I've read, I'm sure they're in bed with Kickstarter in some way. Kickstarter said projects can't act as a store yet Pebble is.
Pebble uses Kickstarter as a preorder platform - it's not their store.
Before products go on sale, you preorder on Kickstarter. After the product goes on sale, you buy them through more conventional means.
Kickstarter likely benefits from this by having more people drawn to their website, and by having more success stories to tout.
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