Apparently, I'd need an invitation to create a profile there. That's fine, I've been around stackoverflow, got a bit of score on SF, shouldn't be a problem, right? Moreover, there are career postings for sysadmins all over the site, so the careers site should cater to sysadmins, right? Wrong. They want to know if I'm a real programmer in order to provide an invitation.

So my question is - why? Why only programmers?