Final Fantasy XIV Database - Ffxivpro.com

Considering the rarity of getting HQ on certain items, I honestly doubt one given HQ item would have a significant impact on the economy as a whole. It'd take alot of freebies to really start affecting the overall value of gil server-wide.

But really it all comes down to how people want to use their skill in craft. It can be used for business or as an open source service for those who want something made with materials they have or bought. Neither way is right or wrong.