The Bard’s Tale (the remake for PC and Xbox and such) dealt with this is a fairly easy way. Enemies would drop money and stuff. Simply walking over it, or having a henchman do it, would autmatically pick up and convert the stuff into money. No waiting, just cash.
Of couse, this was more of an action-rpg, or platform-rpg. But there was very little to collect that meant anything. Everything was just more money.
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