Well as a developer we can build concrete and steel and you can pay 25-40% more for your unit but the question for any developer is if enough buyers will actually pay that... Some areas simply cannot support it or lenders will not lend or equity investors will not invest, etc.
And by the way, you can hear people walk overhead very well in concrete buildings which the residents made us very well aware of after move ins on the first Novarre tower in Atlanta. Concrete is good at stopping low sound but not so good at high note sound. Wood visa versa and wood can be made near silent with proper techniques at a fraction of the cost of going to concrete.
Brian