AM Show host Mark Richardson says people need to be wary of being too nice, after a woman was tricked into buying a $3200 vacuum cleaner.
Betty, whose real name has been withheld, entered into a loan agreement to buy a $3990 vacuum cleaner after being visited by a door-to-door salesman.
The salesman got the deal over the line by reducing the price of the vacuum by $700 down to $3290.
She had her outstanding debt wiped after she complained to the Insurance & Financial Services Ombudsman (IFSO) scheme.
"The best advice that I was ever given by someone was don't be a nice person," Richardson said on the AM Show on Thursday.
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Ingrid Hipkiss and Duncan Garner joked that he'd obviously taken that advice on board.
"There's so many instances in life where you stuff it up for yourself by trying to be nice. There's some times in your life where you've just got to be a bastard and this one of those instances."
"When someone knocks at the door and you don't want what they're offering just close the door because they won't take the first no...the only way is to show them the door."
"People, don't be nice people," Mr Richardson said.
But he admitted that he recently changed his power company over the phone, because it was a really good deal.
Watch the full commentary above.
The AM Show with Duncan Garner, Amanda Gillies and Mark Richardson, weekdays 6-9am on RadioLIVE and streaming live to the rova app on Android and iPhone.