Hard to abstract away the money that it'll cost - which is the original point here. They're doing something that costs money, and people want to use that something, so they're doing what it takes to make money from it.
AWS makes around 26% margins (not broken out, it’s markets best guess). At a medium size it can make more cost effect sense to run your own……with the understanding that you have to build a cattle farm, and pets are forbidden. If you every allow a pet, then just go to AWS, et.al.