I'm just starting to get into buying and selling stuff, but on Iris I sold a lvl 32 SoS + 3 harp with minor (like 20%) increases and int 3 for 7 million and probably could have gone higher.
Of course harps aren't nearly as prevalent as daggers, so maybe 5 mil?
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iSRO - AsparTame 8x - retired
Salvation - Aspar 70