Based on Mark Shuttleworths defence of the Dell petition is criticized in this article by ITWire.
Read it here
For instance, he starts out by asserting that margins on PCs are razor-thin. No figures are provided to back up this assertion. If PC makers are struggling to make a buck, if they show small profits every year and someone makes such an assertion, I would be inclined to take it seriously. But that isn't the case; PC makers like Dell and HP report profits in hundreds of millions or even more every year. From where do these profits come?