A brief look at the market shows that you have competitors. At the least, OI Shopping list appears to have a lot of downloads as well. Your app does show up in the side bar, and in the top free category. This doesn't sound like a market problem so much as a business model issue. If one of the free apps does what people need, they won't pay for a $5.00 version, even if it's slightly prettier. Hell, a quick look at the…
You completely missed the point.
He's not complaining about his business model, free competitors, or price.
He's venting his frustration with dealing with the Android Market as a developer:
1) Stats seem to keep breaking which seem to affect visibility and rank of his app.
2) Search is a problem. He went from top 10 to 200+ and with no understanding as to why that would happen - and so abruptly.
3) The comments system on Android is a mess. (sorted strangely, randomly?)
4) Google has a serious lack of good support for its developers.
I'd like to add:
5) There needs to be more game categories.
6) We want to be able to reply to comments in order to support our customers.