[kortilla]

Sewer, water, and electricity hookups are cheap to maintain and are on the burden of the home owner to repair. The initial hookups and construction are absolutely not covered by taxes (this is one of the significant costs you will find out when you build on a plot).

Street pavement is the only thing you mentioned that does cost the tax base, but how much the poor dense area subsidizes the suburbs is completely dependent on the split of funds. In many of the suburban sprawl regions of the western US, the dense urban city (e.g. San Francisco, Seattle, Portland, LA) has a small jurisdiction and the suburbs are in completely different legal cities with their own road budgets.

>cities, poorer and denser neighborhoods are subsidizing the richer suburbs, tax-wise.

Definitely not well established. What you might be thinking of is poor dense neighborhoods subsidizing rural areas that depend heavily on federal or state grants for pretty much all of their infrastructure.