Also, the common use case of "I don't need this hardware 24/7/365." If you need to do some analysis or computation on a massive data set once a month or someth

Also, the common use case of "I don't need this hardware 24/7/365." If you need to do some analysis or computation on a massive data set once a month or something, it's going to be cheaper to pay $5k/yr (assuming you run for 24 hours a month and don't make use of the spot market) than to purchase and maintain the hardware and infrastructure.