I was a Cobol developer for a year in 2016 in Prague. It's hard to make a proper market research because the Cobol market is small. My limited point of view is, that it's not worth the stress. There is nothing new to build with it and young developers are there just to replace the old ones and maintain what's left. Even that it's hard to find a Cobol developer, i couldn't find a Cobol position that would pay more than a React developer.

The funny part about cobol is that even if you say you know the syntax, there is site specific implementation details/features which are even MORE critical than just the language.

My favourite example of this is that you have to recompile program when a used table schema changes, otherwise it will crash.

edit: Just realized that it's more platform specific than site specific.

If you have time, I would really love to know examples of this. This is very interesting.

See: New Jersey State Unemployment Insurance.