Upcoming mogtome rewards look a bit... boring and uninspired...

[Absurdity]

However, there is gil to be made here if you know what items to get and to sit on and wait for the supply to dry up.

Yes and no. I've done that and made some millions when supply ran dry...but it took probably 2 years of just sitting on a bunch of items which is not really worth it. It's also entirely speculation whether or not the supply runs dry enough in the first place because those items could show up again in the next moogle tomes event.

They have constantly devalued incredibly expensive eureka items in these events so that is pretty blatantly false

A eureka minion like 2 events ago dropped from 11 million to like 40 thousand due to one of these events, I’d say about the only things safe are the eureka equipables like Cassie

This.

But also nothing is really "safe", all it takes is for them to one day decide to throw it into the event for running Cyrcus Tower 5 times.