All this is true but you forget the cost. Mainframe do not allow to start small. I have no idea how much the cheapest mainframe cost but it's porbably more than

All this is true but you forget the cost. Mainframe do not allow to start small. I have no idea how much the cheapest mainframe cost but it's porbably more than a dirt cheap x86 server with a bunch of free software so important for student projects, training, hobbies, start-up and cost constrained industries.