No, they will get less money this way. What should be the purpose of that?
Less people crafting will be the result, not more people subbing. And compared to the money they could make by selling dyes, skins and small tier ingredients on the shop (these for example could be available ingame more common in premium areas), the yearly sub cost is laughable, because it is by no means sure, that people will sub just to be able to craft (they might even just sub one month to do the crafting and stay f2p otherwise).
From customers side, it would be a bad move too. History has shown that people who have subbed, already paid. Their opinion is less worth than someone unsure to pay or not to pay. Just look at the continuity discussions with AA and crafting or the special offers recently.