Funny. No, I just don't think in 2012 that an audio sample editor should cost $300. It's ridiculous. Sony amortized the development costs of 90% of the features of Sound Forge years ago. What's left is just profit. Yes, porting a Mac version took some money, but the cost is shared across both platforms. I just think pricing Sound Forge at $300 is arrogant.
I don't disagree in your premise. It would be great if pricing was set as you suggest; but a seller will almost always try to find a way to earn the most profit, and the price is set thereafter. Also, for most professionals, if this tool gets the job done then it's worth it's price tenfold. Say for example, if it replicates some of the editing features from Pyramix, then it's a steal, as no other editor I've found at that price range does that. And Pyramix costs $1000.