> This however misses one important point. They build it using taxpayers' money. So, if I give you money and tell you "please build me a shed" and then benefit from the shed, of course I keep all the benefits - after all, this shed was built for me with my own money!
If we used land taxes like the georgists proposed, this would be an apt analogy. As it stands though, the property owner is paying, but so are non property owners as well as property owners that aren't benefiting from improvements. It isn't much different from a lottery: the benefits are concentrated, but the costs are diffused. Did the lottery winner pay for his payout? Sure, but so did all of the lottery losers that didn't get anything.
> This is probably not true either. The primary reason why some land is valuable, usually, is location, location, location. It can be close to natural things or to things built by people (e.g. a house within 10min drive of Google campus is probably more valuable than a similar one which has 2hr commute to the closest source of employment). Government-built infrastructure is important too, but usually secondary - nobody would build schools or transit systems in place where nobody wants to live, and people rarely move somewhere just because of sewer and transit system.
There a billions of miles of beautiful coastline in the world, but people generally build coastal homes where there are roads, and don't where there are not. There are billions of locations where google could have built their campus, but they chose a place with plentiful government funded infrastructure. They even payed more for the privilege. Why would anybody choose to live or build a business in a place where there are no roads, potable pipelined water, electrical grids, schools, sewers, emergency services. Government isn't a secondary determinant of land value, it is primary and foundational. The private markets may build upon the land values that the government created in the first place, but take the government away and everything else will go with it.