I think the issue, though, is not if you (or other people on HN) use AppBrain: it's if your customers are going to be able to find your app. I doubt that a sign

I think the issue, though, is not if you (or other people on HN) use AppBrain: it's if your customers are going to be able to find your app. I doubt that a significant chunk of Android users actually use something like AppBrain, so a pre-installed Amazon Appstore might help those people.