@jazz: Naw man, the recipe's just the ticket to upgrade. All upgradeable items are upgraded by buying a recipe, the recipe for that item always costs the same no matter what level of upgrade. It's the same throughout brah.
@jazz: Diffusal requires items plus a recipe to build the new item. Buying the recipe again will upgrade it to lvl 2 and you don't need to build the diffusal again. You're only paying for the recipe to upgrade, not the other component items.
@jazz: It also counts time spent on the menu or waiting to queue so that's not really an accurate number. More like 1700 hours, so there. Best game, favourite game. But playing with a group that's a good balance of wanting to actually win/can goof off and not take a loss so seriously has been really important to my enjoyment of the game. Solo queue is a nightmare, I hate it. I only play with at least one other person on Skype.