Thousands of dollars worth of bids have been removed from the auction to blow up Newstalk ZB's old Christchurch home, Radio Network House, after some bidders were deemed not genuine.
The opportunity to push the button to demolish the 14-storey quake-damaged building has become the third most-viewed auction in TradeMe's history and bidding reached $30,000 last week.
The auction closes this evening. This morning the leading bid was back down to $26,000 after four bids were removed, TradeMe spokesman Paul Ford said.
One bidder had a membership with bad contact details, which left moderators uncomfortable with leaving the bid on the auction.
Three other bids were removed at a bidder's request.
There have been more than 400,000 views of the auction.
Auctions that attract high figure bids or large amounts of traffic are watched closely by moderators, who check with bidders to confirm they intend to follow through with payment if they win.
"From our perspective, it is frustrating when a bid is removed, but it doesn't happen often," Mr Ford said.
"It's annoying - if you don't intend to follow through and pay, then don't bid."
TradeMe keeps a record of people who repeatedly ask for bids to be removed, which can result in a user being suspended or eventually banned.
Bidding on the Radio Network House implosion closes at 6pm, with the winner given the honour of pressing the button on the controlled demolition on Sunday.
It will be destroyed in 7.7 seconds by 60kg of explosives and will be the first of its kind in the city since authorities began the task of bringing down hundreds of quake-damaged buildings.
The most viewed auction in TradeMe's history was the sale of a handbag and cellphone that Tana Umaga used to reduce his Hurricanes' teammate Chris Masoe to tears, which attracted more than a million views.
Umaga swung the handbag, with cellpone inside, to hit Masoe twice in the head at a Christchurch bar after the Super 14 final in 2006.
Proceeds from the auction to launch the Radio Network House implosion will go to restoring the Isaac Theatre Royal and other heritage Canterbury buildings.
The final bid price will be doubled, with the Government pledging to match fundraising dollar-for-dollar up to $10 million.
MOST POPULAR AUCTIONS
1) Hurricanes Handbag & Cellphone, closed June 3, 2006 - 1,072,893 views
2) Scary washing machine. No really, its terrifying!, closed June 18, 2009 - 810,802 views
3) Radio Network Implosion, current - 432,931 views
4) YOUR Tattoo on my Bum!!, closed January 20, 2012 - 355,889 views
5) Buy a Tractor and get a 20 acre farm for free, closed May 24, 200 - 384,705 views
6) Landscape Rocks for Sale in ChCh, closed March 7, 2011 - 316,350 views
7) Folden 2010, closed May 6, 2010 - 292,184 views
8) Jesus Christ Pita Bread, closed January 8, 2009 - 276,094 views
9) Two days in the studio and advice from Neil Finn, closed January 9, 2012 - 258,775 views
10) MiG-21 MF 1973 Mikoyan-Gurevich Fighter Jet, closed September 3, 2010 - 257,093 views
11) Flying hovercraft, closed March 13, 2010 - 248,607 views