> Which is crazy, right?
No, because this is not accurate:
> Homebuyers will make purchasing decision based on their monthly mortgage payments, instead of the home price.
Homebuyers make their purchasing decisions based on the options available to them. They are not paying $x because they can afford $x+1, they are paying $x because that is how much they are willing to spend on that specific house in that specific location. The latter portion of that statement is important because implicit in it is the competitive nature of humans, and so it manifests as people competing to purchase land and being willing to pay as much as they can afford in exchange for the utility from that specific house in that specific location.
That utility can be in the form of access to income opportunities to lower future volatility of income, access to other people of similar or higher income so your kids can go to school with their kids, access to airports, downtowns, outdoor recreation, etc.
If you are projecting increased demand during your entire lifetime for the piece of land you are purchasing, then it makes sense to pay as much as you can afford, as it will only get more expensive. If you are projecting a receding economy and/or decreased demand for the land you are buying, then it does not make sense to pay as much as you can afford, but rather scale it to some measure of what utility you will get out of it.