So you were essentially crafting them millions of gil worth of items for free? Sounds like you were used and abused to be honest. I would take my business elsewhere if an FC pissed me off to the point where I would be forced to leave. There should definitely be some sort of compensation from your guild members when you craft things like that, whether they give you the materials to craft it or money in a way of tipping, because otherwise you're going to lose a ton of gil crafting for someone when expansion is literally 10 days away. Imagine, all that crafting/gathering gear you made them quite literally has an expiration date.
Regardless of what happened, I wouldn't go back to that FC. Who knows when they'll feel like just kicking people again and you don't want to sink any more money into something you're probably not in the long haul for.
Whoa, wait... what?
There's a Lala LS!?!?