[HAL9000]

You're not a business that requires 5x9 of availability.

You have no knowledge of our business, so how can you possibly know our availability requirements?

[Bush2000]

You have no knowledge of our business, so how can you possibly know our availability requirements?

You revealed yourself when you questioned the cost of availability. If you actually required 5x9's of availability, you'd know that cost is secondary to the fundamental uptime requirement of running a mission critical enterprise (ie. power plant, 911 service, etc).