In AMD's case, I think at least some of the loyalty to them is more than fanboyism. They're the only competitor to Intel in the desktop CPU space and Nvidia in

In AMD's case, I think at least some of the loyalty to them is more than fanboyism. They're the only competitor to Intel in the desktop CPU space and Nvidia in the GPU space, and they're in a much more precarious financial position than either competitor. If AMD go away, both of those markets become completely monopolized. So in a way, it is to everyone's benefit to disproportionately support AMD.