I can't see a type of datacenter it doesn't apply to. You pay for transit, power draw, and to a lesser extent rack units. If you get a rack or a half rack with your expected power draw and want to spill past that they'll be charging you extra because that's space they can't sell to someone else. Some datacenters also provide cages, so your hardware is physically separated from other people. That'll cost extra too.

The only thing I didn't see a mention of is DC power, whereas your out of the box power supplies on most OEM equipment is for AC. Most of the server supplies nowadays should be able to handle 240V, 208V, and 120V with AC on the same unit, when you go DC you want to consider buying a separate AC power supply for setting up the server in your office (unless you drop ship it to the colo).

Make sure you get a very efficient power supply too, because while you can get the most efficient or power miserly server on the planet, an inefficient power supply will increase the draw significantly. You also want to right-size the power supply, because drawing too little power lowers the efficiency (there's an efficiency curve available for most PSUs that are rated).