Android has several issues and I agree that the market app sucks, so I use appbrain. Give a try if you haven't already. It gives decent recommendations and you can filter apps by hotness among other things.
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.
I never implied otherwise (I agree), just spreading the word about appbrain.