Err..
Who cares about market share? Market share is only significant as an crude indicator of relative business size.
If you are a shareholder, what you care about is profitability. Not the profit per box - but the total profit made by the division. The number of boxes shifted is irrelevant.
Anyone knows that Apple could slash prices, slash margins and sell many more boxes. The question is, would doing so increase or decrease total profits? Looking at the numbers, Apple clearly make more profit than Acer. And without checking, I think Apple make more profit that HP's consumer division.
If we sorted the market share by dollars and not by units. I think these tables would be much more meaningful.
C.