For what it's worth, from a previous time this conversation came up
How exactly do you put together a book list like that when we have no contacts in Cathay whatsoever, and no way to check for what we're getting until it's back here, on the other side of the continent?
Yes, Belegar is putting forward exorbitant sums of money for this, but I think it's probably more worthwhile to look closer to home, first. We'll certainly be getting more for a given amount of money.
There are advantages to looking closer to home certainly, but unless I am much mistaken that conversation was before the Library was actually in the cards. With it existing now there is one other advantage of going for exotic books, it is going to make other institutions of learning more willing to work with us. Where else are they going to get any sort of Cathayan books?
Even if they are not the best, even if they are not complete, even if some of the information in them is known, the sheer rarity means they they are worth quite a lot to many institutions and K8P is really one of the best placed libraries to actually get their hands on such books as it is literally on the road to Cathay.