A surprise massive bill can be worse than no solution at all, in my opinion. And if the easy path leads to massive-bill lock-in, that's also not very helpful. It's not like people didn't know how to run servers and remote storage before AWS showed up. Before AWS showed up at least your data-center costs were pretty predictable: you managed the servers yourself, so whatever the salaries summed to, that was it. It's not like poor programming ate up your years' IT budget by May.
But you did waste money through capacity planning. As you either have the exact quantity of servers needed, or you have some sitting there idle. Then there’s swapping out older/failing hardware. In fact your DC calculations are rather difficult to get accurate.
