You'll note in my question I didn't speak about banning or preventing. I asked if any professional sysadmins used cPanel, later corrected by others to be, do any IT professional really use cPanel. Banning is something other people have inferred.

@JohnGardeniers cPanel is primarily focused on web hosting, it's branched out over the years, but that's where it started. I don't use webmin, and can't stand it, but my point was that if you want a GUI to administer a UNIX server, webmin is more generic than cPanel, it's free (cPanel isn't). cPanel isn't generic enough to be a real server admin tool (no support for Samba, AFAIK, for example). I wasn't supporting webmin, just putting an other nail into the 'cPanel is a general server GUI admin tool' argument.

@Bryan I think the reality is that many small companies who host their web sites on systems that use cPanel have them supported by the web developer who wrote them. However, I'll re-iterate, the driver for my query is the low quality of nearly all cPanel questions on SF. I almost spent a couple of hours today cataloguing exactly how bad it was before I realised that would have been a monumental waste of my time.