You are mixing things up. Just pricing your product based on demand does not necessarily make you a scalper. It's the fact that you are not the producer of the

You are mixing things up. Just pricing your product based on demand does not necessarily make you a scalper. It's the fact that you are not the producer of the good itself that makes you one. To use the real estate example, there is a difference between a developer selling a house it built, and an investor selling a house that he bought when it was cheaper.