You don't buy expensive, power-hungry [hard]ware that's going to cost an arm and a leg to store, power, and cool for the next year when you only need its brute force for a few hours.
But he is planning to do conversions over and over, one after another, handling problems as they occur. As such, one of his goals is that the conversion be as speedy as possible, and he specifically said that he doesn't want to share a CPU with other cloud users. He wants one fast CPU devoted 100% to his project.
Makes sense to me.
Cloud servers with no virtualization and 100% of the CPU? That's what OnMetal is for, motherfuckers!