Is that rented gear in someone else's racks or your own gear in racks you rent? Beyond a few boxes, the TCO of buying your own gear is far, far cheaper (look at the prices of Supermicro boxes, not luxury, overpriced enterprise boxes that aren't use-case appropriate).
Someone also has to know how to negotiate with DC's (because power circuits are often the biggest cost factor) and how to separately get good deals on fiber (which is usually far cheaper than the DC's charges because most customers don't know better). DC's often nickel and dime for simple tasks if you don't do it yourself (or have hands that can do it for you). (RackSpace used to charge something $75 every time a box need to be reimaged. DC's will often take forever and charge several arms and legs to rack & stack & cable in your cage, but you will still be at their mercy for freight & delivery and pulling outside fiber, electrical circuits, cooling & rack leveling.)
Overall though, it's still cheaper for web-ops shops to do bare metal in (Google, Yahoo, Apple, etc. in their own DC's and other large/medium shops with predictable baseline loads in someone else's DC's) otherwise everyone would be using AWS. And that's clearly not the case for anyone who's ever been in a real enterprise shop.
Look at Wikia or most any other enterprise shop for baseline loads: mostly bare metal, because it's far cheaper for people whom know what they're doing. Also, BackBlaze... pretty much no way to undercut with them apart from buying an HDD manufacturer and going multi-datacenter-scale.