I have an alt purely for lulz/RP purposes but it's mighty inconvenient when something drops in coil that no one wants that I could have used on my alt. The best combination of gear comes from myth gear/allagan and with the increase in myth cap and as time goes by and you people obtain more coil/CT drops the appeal of leveling several alts suddenly becomes low.

The only good option for an alt is if you wanted to have all crafting/gathering on one character with maybe one battle class for farming and have your own separate battle character but if they ever increase inventory this also loses it's benefits quickly. For now you may be getting ahead of the game if you are cool with spending your entire week farming myth for all of your classes across several alts but as more sidegrades open it will yet again become less viable.