Its a job that takes a lot of know-how, specialized knowledge, and expertise. If many other people cant do it easily, it will demand higher pay or people won't do it-hence the shortage they are facing.

We really underestimate how big a deal the smartphone is/was because it's become such an integral part of our lives that it's mundane. But when we think back to the days or carrying a MapQuest print out, a camera, paying $0.10 for a text. We have massive amount of info at our fingertips.