Yes, I thought about comparing profit but actually I think revenue is more interesting because it represents to some extent the company's "weight", or spending power. Apple may spend a lot to manufacture their devices, but that spend also represents part of their huge influence in the computing landscape. It accounts for things like retail stores and massive advertising budgets which are enormously important. Sure if you only look at revenue then you over-estimate their influence but you equally under-estimate their influence if you only look at profit.