ATM it breaks down like this:
-Farmed recipes are tradable
-Plat Recipes aren't
-Crafting materials have the drop rate of pinks IMO
-Finished products of both ARE tradable

AND FINALLY ... IDK if anyone else has noticed this? But from what I can tell
-Plat recipes actually require MORE crafting components then NON-plat recipes

Which for those of you concerned it makes it to easy for people to craft that should offer some sort of comfort