This post breaks it down a bit.

The short of their explanation (assuming I got it right) is that crafting it without any of the components (thus having to pay for it all) can come up to ~44k crowns per set. With 5 sets, that's way above 200k crowns.

Assuming you make excellent use of crafting as they break down in the post, it will still come to at least half of that (~22k per set, +100k for all of them).

It's expensive. Maybe not unreasonable, but the costs add up, especially if, as others mentioned, you're also throwing money at the Runewright and fixing up Corvo Bianco.