The savings is with not having to deal with HR to manage the people hired to keep your local systems up and running. The tradeoff is that if you have a sudden

The savings is with not having to deal with HR to manage the people hired to keep your local systems up and running. The tradeoff is that if you have a sudden hit event you may simply not have the raw horsepower to handle the influx, but you also can't be hit with surprise $100k+ bills for a configuration mistake.