Good money to be made working at Coles/Woollies warehouses. Not rocket science, but it is output driven so it's not like you can turn up, sit on a milk crate for 12 hours and walk away with $1,000 or anything. You can easily do that working at one of the shops, but you'd make closer to $100.
The most overpaid professions I've come across so far are tradies, draftsmen and real estate agents.