I don't really understand your point. Is it that govts can intervene and tell you to sell at a different price?
The OP was arguing that you can charge what you like for your product regardless of whether the price is fair or not: as long as people are willing to pay it you can charge it. My point is that you do have to factor "fair" into your pricing at some level. If you completely ignore it then you will annoy enough people that governments will eventually act, especially if your profits rely on an artificial monopoly created by those governments' laws.