Density is not going to drive down cost for the same kind of housing. A SFH is not the same as a smaller home on a denser plot, much less an apartment block in a high rise. So the SFH owner who pursues increased density does indeed benefit.
Even from a quality of life perspective, imagine having an SFH in city center that is within walking distance to shops, job, activities etc.
Even from a quality of life perspective, imagine having an SFH in city center that is within walking distance to shops, job, activities etc.