Business consultant Lance Wiggs, who was an adviser to Trade Me founder Sam Morgan during the company's sale to Fairfax Media in 2006, said it was sad news.
"It's sad that they've found themselves in a place where they have to sell their best asset," Wiggs said. 'They're also opening themselves up for a competitor, a media competitor who is a bit more hungry to come in and take Trade Me."
Although Wiggs believed Trade Me would be held by institutional players such as pension funds in the short term, he believed rival media companies could look to snap up a controlling stake in the company.
Australian rich-lister James Packer could look to up his stake in the company, Wiggs said.
Packer is the son of media tycoon Kerry Packer and his companies have a stake in Australian television company Foxtel. Forbes magazine this year valued Packer's wealth at US$4.5 billion ($5.3 billion).
Ellerston Capital, a fund manager controlled by Packer's family interests, emerged in August as a substantial holder of shares in Trade Me, owning about 5.18 per cent.
Wiggs also suggested the digital arm of Rupert Murdoch's News Ltd could be interested in Trade Me.
With Fairfax losing control of Trade Me, he said, its New Zealand branch would need to make a renewed push into e-commerce to rival APN's efforts with daily-deal site GrabOne.
Former Trade Me director Gareth Morgan said the sale said more about Fairfax than Trade Me.
"If you look at the Fairfax share price, the Fairfax balance sheet, those guys are in reasonable trouble. If you look at their revenues, they've got a lot of debt, they've got to be under pressure. When you're put under that sort of pressure what you tend to have to do is sell the jewels in the crown. They've probably in the awful position of having to do that."
If the rest of Trade Me was sold on market, Morgan said there should be reasonable appetite for it, depending on the price.
"It has a very secure cashflow, so in that sense it's a good income stock. It's also got growth potential."
Morgan believed the company would be bought by institutional investors, rather than an entity coming in and being a controlling shareholder.
Transaction list
Founded 1999 by Sam Morgan.
Sold to Fairfax in 2006 for $700m.
December 2011, Fairfax floats 34 per cent on NZX, raising A$364m.
June 2012, floats a further 15 per cent, raising A$160m.
The final sell-down could yield A$616m
Read more: Liam Dann: Selling Trade Me will please the bankers