Silver,
You are ducking the issue. I asked you where you stood on profitability. Either you saw this as a government project, in which case profit was not a problem, or you stood by your claim that this would be the "most profitable airport in the world".
Clearly, you have retracted the latter and gone with the former. That is fine, but the examples you gave were of privately funded projects which lost money for their investors, hence you have just further trashed the latter point.
You appear to have confused the airport being the largest in the world with it being the most profitable. The two are very different concepts. Small is often beautiful!