This is the second case of shill bidding on online vehicle auctions prosecuted by the Commerce Commission this year.
In May, Auckland-based The Auto Company (Millenium)
That fine was on top of more than $122,000 already paid in compensation to affected consumers and Trade Me.
In sentencing Rutherford, Judge Chris Field said while he accepted there was pressure on him to obtain a minimum price, that justify him acting in an "illegal and immoral" way.
"Your activities have impacted upon Trade Me's good reputation. The fact that you say it is rife only highlights the need for denunciation and deterrence."
Commerce Commission head of investigations Ritchie Hutton said shill bidding undermined what is supposed to be a transparent auction process.
It created the appearance of high interest from other bidders and caused genuine bidders to pay an artificially inflated price.
"If shill bidding is tolerated, consumer confidence in Trade Me auctions as a reflection of the true offer and demand for a good could be compromised."