What area in Linux/UNIX is most in demand?

What area in linux makes the most money. What area in linux is most in demand.

When I was a teenager, I used to read Hot Rod Magazine. In one issue there was a joke with 2 young guys, and one says to the other 'We have a Stromberg 97 carburettor and a 9/16th box end wrench. What else do we need?'
By the time I had built a national championship car 20 years later, the tools were metric and we were using Weber carburettors.

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