Concord cost $400,000,000 makes sense

Pretty simple logic.

Spider-Man 2 cost was $300,000,000. 

Spider-Man 2 was made on an existing engine.

Spider-Man 2 used existing assets.

Spider-Man 2 didn't require network code.

Spider-Man 2 took five years to make.

Concord started production before UE5, so probably started on UE4, then was ported to UE5.

Concord assets were all freshly made, probably unnecessarily, 4K assets.

Concord required network code and network equipment. A single, average Network Engineer runs about $140,000 a year. That doesn't include a security expert.

Now spread that over 8 to 10 years. 

It is a miracle if the cost was a mere $400,000,000.