This is exactly the problem with the app store. People have an idea in their heads of what an app is worth, no matter how much work it took to produce it. Price is completely decoupled from cost and from sales volume. This is like saying a Lamborghini and a Kia should both cost $9999 because they're cars.
Ultimately this is going to lead to a ton of low quality junk in the market. A quick perusal of the top 50 selling apps suggests we're already there.