Depends on the systems you're admining. Small offices tend to hire an IT guy that runs the network, email server, website,and desktop support 24/7/365 for $40k salary.
If you are doing Enterprise SAN, Virtualization, Cloud, Unix/Linux/Windows/DBA work, it can be different....and maybe easier (by knowing more config/troubleshooting)
I can't say that a job requiring help desk is a bad job. Some software companies use admin jobs for backline support too because they know osi model and TLS (layer 5 and up) to help with authentication crap....and if you ever get stuck with a company that doesn't have good staff doing that, it sucks.