As the saying goes, if you can’t take the heat get out the kitchen, which in this case is the App Store. At least that’s the feeling left with one iOS App developer who plans to close its doors at the end of the month after failing to turn a profit in its 18 month run. BeamItDown Software had high hopes of flourishing on iOS with its e-book reader, but with Apple’s 30 percent take it simply couldn’t survive selling books at a loss.