Yep, and good RPG programmers can charge very high rates!
I spent a few weeks talking to recruiters while looking for a new job in South-eastern PA and at least half of the jobs that were pitched to me involved at least some amount of AS/400 development.
The other weekend, I grabbed a bit of the Washington Post classifieds to set a paint can on. The first or second ad that I spotted specified JCL, COBOL, and CICS.