Let's talk about Tomestones. (Theories and Spoilers)

[Fenral]

Rowena's been selling them to Cid, who provided her with exclusive distribution rights on Ironworks Gear in exchange. Cid is supposedly working on fast-forwarding our level of tech to something closer to Allagan levels, so would need as much data as he can get to accomplish that. All this leads to the grand prize: Syrcus Tower, an energy source so powerful that not even the people who built it could handle it without far-reaching consequences.

Assuming something doesn't go horribly wrong before then.

[Galaticus]

Rowena's been selling them to Cid, who provided her with exclusive distribution rights on Ironworks Gear in exchange. Cid is supposedly working on fast-forwarding our level of tech to something closer to Allagan levels, so would need as much data as he can get to accomplish that. All this leads to the grand prize: Syrcus Tower, an energy source so powerful that not even the people who built it could handle it without far-reaching consequences.

Assuming something doesn't go horribly wrong before then.

However with the latest expansion Rowena is selling Doman gear in exchange for tomestones, she may not be dealing exclusively with Cid- even before Poetics she dealing with tomestones which leads me to believe that she has her own motivations.

[Fenral]

However with the latest expansion Rowena is selling Doman gear in exchange for tomestones, she may not be dealing exclusively with Cid- even before Poetics she dealing with tomestones which leads me to believe that she has her own motivations.

Cid (rather, the Ironworks) has an exclusive contract with Rowena over that particular set of gear, but it doesn't go both ways. She gets all sorts of stuff for all sorts of clients, presumably Sharlayans and Garleans as well.