Oh, heh, the fact that you said you were selling low value items made me think you were lower level. In that case by all means please ignore my "lowbies wasting effort on loot" spiel
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Instead, I think the solution is simple: go for higher value item camps that sell easier (or else go for the rare high level cash camp like NG)! I know Howling Stones is very popular among Necros for exactly that, and the treasure hunting guide has other ideas too.