Unattached EIPs cost $0.005 an hour. Over time this can compound into a waste of money. Using Cost explorer, we could see the rising cost of elastic IPs month over month. It grew to $300 a month and over time the waste cost about $1000. Once seeing this the customer could go in and remove the EIPs and identify the source of the where they were being unattached to stop this happening in the future.