It does only make sense if you are competent enough to manage data, and I mean: Any part of it, forever. It's not impossible, of course, but it is really not as trivial as the self-host crowd makes it out to be, if you absolutely need a certain amount of 9s of reliability. There is a reason why AWS etc can exist. I am sure the cloud market is not entirely reasonable but certainly far more reasonable than relying on some mid consultant to do this for you at this scale.