Why have we been forced to pay all this money?

We have a problem here in Dunedin. The stadium being built at a cost of $200million, plus interest, and with little likely custom when built, is supposed to be built in time for the World Cup games. It had to be built becuase the House of Pain was unsuitable. However if the new stadium is not complete we are assured the WC games can be held at the HoP. Makes me wonder why we need to spend the $200Mplus in the first place.