More like anything related to iOS gets traction - I don't recall seeing a single Android-specific or even compatible project on Kickstarter, let alone the most successful ones. It helps if design-y people love your products/brand.
iOS devices present a (mostly) constant form factor, allowing a large addressable market with customers/funders who are willing to pay for quality. A rigorously-designed dock can address not only iPhones, but iPods as well.
That's the Apple platform strength - the weakness is changes are sometimes sudden and can eliminate or subsume 3rd party product markets entirely.
