Consider getting a DoH up to 50 for Moogles.
Depending on your server, Glass Fiber can sell for a decent bit of money, though now that HW is old content, the price fluctuates. Not sure what all it is used in, but on Lamia the prices go from 8k all the way up to 30k per. Once you max your reputation with the Moogles, you can get 9 Kupo Nuts per day and it only takes 7 to buy one.
I imagine as time goes on, fewer and fewer people will mess with Moogle quests unless they actually need <Lv60 XP on DoH classes, so that will pull the supply down a bit, until they are in demand, then some people will go out and get them when the prices are good, etc. These Moogle Quests are also nice for quick crystals; 3 quests that yield 20 Crystals each of various elements. If you don't plan on doing any serious crafting, you can sell the crystals on the market.
That also leads me to another point: Getting a DoL up to gather Crystals. Crystals (not shards) will always be in demand due to nearly every recipe in HW+ needing a minimum of 5 of various kinds for each synth. Some of the harder-to-get crystals tend to be Lightning and Wind, or at least from my experiences that's how it tends to be. I have 2,200 of each Crystal except for Lightning and Wind, I only have 1500 of those two, because the Moogles give them a lot more rarely than they do the others (especially Earth and Water, I've got a metric ton of those).
Leveling a DoL is easy, just use GC turn-ins every day, and each week make sure you do your Challenge Logs. You don't really need Scrip Gear, just get to 60+ so you can access all of the HW Nodes. Once you're Lv60, all crystals will have 100% Harvest rate, though you might want to try and push stats with gear to take advantage of Gather+ nodes; vendor gear should be good enough, esp the 61-63 stuff.
