Entirely for lore/glamour purposes. Sure you can get a better weapon than the purchaseable ilvl 115 weapons that way... but you can also use augmented Ironworks stuff via poetics tomestones for that.

The one thing I will say though, is to make sure you upgrade your gear in some fashion rather than sticking with the gear you had when you hit 50. Although the quest level requirements won't go up as you do the MSQ until you hit Heavensward, the assumed item level it's balanced around will go up, and you'll be expected to be item level 115 at least, although getting item level 130 gear will keep you good until level 54.