Everyone is freaking out because of supposed "plat costs" and drops, and I think I can outline it to make sense. This is what I have understood.

(in reference to level 55 crafted items)
Each super duper 55 pinks requires the pink itself, the recipe dropped from bosses, and other recipes made with crafting supplies. There are two types of recipes:

1. Pink "blueprints" allowing you to make items.
2. Supplies made of other supplies. (like leather and bow materials)

The first are dropped from bosses and are tradable. The second are made with daily quest items or bought with platinum. You don't need blueprints to make supply recipes, only the final products.

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I could be wrong in an area, but this is what it seems is the system. The devs wouldn't be so outrageous to make us pay in platinum for blueprints to simple supplies.