It's a free market. Prices will adjust to demand. People buy at $3, it will sell for $3. People buy at $30, it will sell at $30. Complaining about it is stupid. Apps take time. Time=Money. You have to sell a huge volume of $1 apps to make a living. I don't fault developers for raising the prices on a bigger screen platform.
Don't like the prices? Vote with your wallet. Don't buy the app. It's simple.