How does cid make power?

I’m lost over the $3000 to $4000… why would it cost that much more to build a stroker?
Especially since he never includes the proper top end but just stunned s the engines ability with what ever it came with on top to begin with because it was fine for the smaller engine.

This is his comparo factor. Stock engine kicked *** but now I put a 4 inch arm in and the engine blows chunks.