If some of the blanks are only available in the DDO store i personally think that crafting may tip the scales towards being a pay to be uber game.
- no items in game at the moment require a purchase from the DDO store outside of packs which are not a "consumed resource"
- no ITEMS in the store are required to play the game atm aside from packs
- if the trinket blank is exclusively found in the DDO store who is to say that there won't be other DDO store exclusive blanks? this could very quickly become a very disturbing trend towards purchasing the ability to craft things that other people who may play/work even harder in the game cannot simply by whipping out a credit card.
edit : i hope i'm just doomsaying