MOQ is the same as before. Stickerbooks have smaller MOQ. So in general stickerbooks are made in much smaller batches and are rarer.
For runs smaller than MOQ (ie. 1k) it is a special arrangement but for those they use the metal that did not pass QC
As for price it is due to hype more than anything. The average steelbook collector just bases the rarity on what they read and have no idea on what is really rare. They wait for info so if there's no info then it doesn't register on their radar. Once the news gets out then you'll see prices shoot up.