I don't think Shichibukai job is to loot or do odd jobs.
Shichibukai is an elite unite for the WG respond only to the WG. The looting is more like a tribute/contribution the Shichibukai made to the WG so they could keep the Shichibukai title and privileges.
Well, aside from giving those contributions to the WG their other purpose is basically to maintain the balance between the three big forces ( Yonkou - Marines - Shichibukai ).
Although Kuma might be an exception since he was basically the WG pawn, presumably because of some contracts that was made.
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