My question is, what exactly are you going to do with it?

Honestly if you don't have a house, gil is kinda worthless. I have never really found anything worth dropping major gil on unless its the high end crafted stuff. Still millions for a full set of 640 is still only temporary since you can slowly earn higher.

Its not like FFXI where it took forever to build up gil, because there was no way to make money and almost EVERYTHING required it. There in that game this kind of thing would have been very worthwhile. There they also had problems with gil sellers and all kinds of crap due to not having that type of thing. You had to grind every gil. Here I can't even imagine gil sellers making much money because almost nothing other than superficial crap is sellable.

FFXI and FFXIV are two totally different games when it comes to in game currency. Hell lets just say it, they are two totally different games period.