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It's probably there so you can "twink" your new characters. As the first plans you have access to have a large range of level requirements. ( Assuming those plans are in the correct BS level )
Currently they range from 19 - 60 @ BS level 4.
If you look on the AH, all the recipes seem like they are legendary, which leads me to believe they probably don't drop until inferno, hell at the earliest. As for the white staff you got in act 4... I'm not sure if I would consider that a real "recipe" as it is only really good for one thing :)
Are you asking about plans (like, a recipe for a specific item to craft), or are you asking about the Blacksmithing pages that drop in Nightmare and above that level up your Blacksmithing/help you craft stuff after level 5.
As someone said, I think the only plans I've seen are for Legendaries.
Just so everyone who is confused is clear:
1) You level up blacksmith and get new patterns each level
2) Higher levels require pages, and even higher levels require "books" or whatever they're called
3) On top of the stuff you can craft just from leveling the BS, you can also find special patterns to teach him additional things. THESE patterns are what this post is about and these are very rare.
As others have said, likely used to twink. This will be awesome in Hardcore, as finding a pattern will give you a big advantage when you finally die.
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