I'm actually a huge fan of scalping and hope it happens more. Here's why: many of your more dim-witted, more or less middle-class "free market" bros will gladly tell you that the value of a good is set by supply and demand. Hospital care is so expensive because there are comparatively few doctors, MRI machines, etc. in comparison with the entire population. Houses are so expensive because everyone wants a house and it's an appreciable asset. I've seen these people my entire life. They'll decry socialism and make the age old joke that "socialism is when no potato." But the second a PS5 gets a street price of 700 bucks, suddenly they become walking "Homer Simpson fading into the hedge and coming back out wearing a different outfit" memes. They'll say things like "scalping should be illegal" or "the government should step in to make sure that the actual consumers who want one can get one - nobody should be allowed to buy 500 of them and just sit on them forever." Suddenly, market economics produces a state of inequality that doesn't directly benefit them, and the guiding hand of the government should be used to ensure equitable distribution of resources. Not that they'd ever reflect on this in any way or consider how their personal experiences indicates a larger set of structural problems with the economic systems that produce such a state of affairs.

I feel like North America could fix its housing issue by simply abolishing the single family housing zones

I think the difference with the first 5 is that a manufacturer sets the price, scalpers purchase it by that price and sells it at a much higher one.

The house price just fluctuates continuously and when the "investor" or "scalper" purchases it, it was available at that price for everyone (or did he purchase it from another scalper?)

Yes, the problem is the high prices of houses, but to reduce it we need to either increase supply (encourage building more, perhaps changing zoning laws to allow more homes etc) or reduce demand (increase interest rates (that though make it harder for regular people), restricting corporations from purchases, banning Airbnb (yes, they drive prices up, and if you use them, you are contributing to it), penalizing if unit is not occupied (though enforcement of this will be hard), or banning foreign investors.