What business model doesn't want to reduce costs?

You're missing the point. EC2 specifically didn't work for them because they were constantly spinning up new instances and killing old ones, so they were repeatedly incurring the minimum one hour cost. If your business model doesn't call for that sort of a workflow, the article is irrelevant to you.

Exactly. I use EC2 by running my instances 24/7. That article is useless.

Plus, Amazon has servers here in Brazil, so that a plus to me.