I was able to pretty easily hunt a few of the 1k items by only gambling 1k. Was able to acquire 2 God/Abilities and 2 Three Seals after about 300k worth of gambling. Along with several of the Cure units.
I used to do when I was a lowbie alot of 1k, because it's the least effort. Just empty inventory, set Pad/xpadder to turbo you enter button and let it continually circle, check every 5-10 mins.
I never wasted my time doing many 20 or 100 because I couldn't auto it and wasting my time on monofluid and chatting to an NPC is kinda boring. I'd rather be hunting that stuff.