It depends on place to place but sometimes space is limited. I know some places need "off-site" backups that are within walking distance (not really too off sit

It depends on place to place but sometimes space is limited. I know some places need "off-site" backups that are within walking distance (not really too off site). For companies in NYC or populated areas space is a factor. Also if a machine was half as power consuming, twice as powerful, but you could only fit one in your entire datacenter, I don't think many would go for it. Having many systems is a failure tolerance assurance. Being able to increse your power efficiency, processing ability, AND capacity all by switching to a single system that's priced competativly/cheaper to the market standard? That's a wining combo.