Chillopedia | The iMac has held the crown of 'best all-in-one' for years. But recent developments by other competitor manufacturers are starting to see impacts on the numbers. Why should Apple be worried? Firstly, there’s the numbers. In 2010, all-in-one computer sales were predicted to be up 68 percent, to 11.5 million units worldwide – with Apple's new iMac losing 12 percent of its 50 percent market share.