It is more a inconsistency in what they say they offer and when they give you the reward.

When they offer the reward, they say they will give it to 'a select few' adventurers. however when they actually give you the reward, they say 'as promised.

here is the txt from the carpenter guild:

A'naidjaa: Excellent! Then bring to me a single pine dagger grip. The guild is prepared to offer a select few 100 earth shards as recompense for their efforts.
*Hand in pine dagger grip
A'naidjaa: The deed is done, then. The guild couldn't be more pleased with your work. Here is your reward, as promised.
*Given a spool of copper wire
A'naidjaa: You are turning out to be rather useful, I must say. Here, a token of the guild's appreciation.
*Given 3500 gil