I disagree. What's ridiculous is the price paid, which I really struggle to understand.
Unless you were close to the months of negotiation, due dilligence and funding, then it would be difficult to understand. Without the details, impossible to say
I would point out that I can borrow against my house at well below 5%, so borrowing against airport infrastructure and revenue will be significantly below the 5% you assume
Maybe its me, but I struggle to understand those who champion various airports over others.
Most are people who are championing their own city and airport "support" is part of a bigger thing of championing anything to do with their local town or city. Explains why the Heathrow thread is relatively quiet. No one in London feels the need to "big up" the airport or the city in the same way people from regional cities do.