The Cloud..
As ever, buying into the cloud only makes sense if you understand what you're paying for. A good chunk of my business runs on a second hand blade running in a spare room. Running the equivalent workload on AWS would have cost a six figure sum over the years I've used it - but as I don't need super low latency, fail over or load balancing, a £400 machine turns out to be a bargain.
Unfortunately, many businesses (falsely) assume cloud services give them all sorts of safety nets where sometimes on premises kit would be entirely satisfactory.