Oil lamps can be used in magical work the same way as spell candles. They are in some ways safer to use because it is much harder to knock them over. The oil added to the lamp can be infused with herbs, roots, and minerals making the oil that much more potent for your spellwork. For Money Drawing add pyrite or lodestones, for love drawing rose petals and so forth.
Hoodoo Shops have been known to have money lamps burning at their place of business during opening hours to attract money inwards.