Who cares if you "know" the marketplace? look in consignment, see what stuff is selling for - not just sitting there that is.
Seems like 698k for weap elixirs on Azteca is a bit high, I went through all 40 pages and grabbed the ones for 420k, a bunch for 500k, and sold them for 600k. It's not much, but it's a couple million easy. The rest of the profit overnight was dim holes.
Once you hit 35 you can do FGW's for drops and sell them too. And the extra dimension holes you can sell for 100k - 1.2 million depending on level. I got a couple of 81-90 1*'s last night and both went for 1 million. Most of them were 71-80's but my staller had like 5 million when I looked and there was only 1 left.
Arena coins are nice to buy/resell too, I don't do it myself but one guy in our guild took a month and did only coins/stalling and made 600 million, which he then turned into 1.2 billion or so. I think he's still got lots of pandoras from events too.
Another guy - who went inactive now - only did dimension holes when that update came and made 580 million just farming dim holes all day. But FGW is decent XP if you want to solo a 1* and the possibility of a drop that you can sell. TBH I do all 3 or 4*'s now cuz if I get a drop, I'd rather have 4 spell papers or hyungnoh armors than 1
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iSRO - AsparTame 8x - retired
Salvation - Aspar 70