I sed to be a network admin (10-11 years ago) and got stuck doing some DBA work and enjoyed ut. I then did software development for 3-4 years while still doing DBA on the side. In the late 90's I made the switch to fulltime DBA. It was easier work in general, but when things broke, it was way more stressful. One mistake by a DBA is usually much worse than that made by a programmer or admin. Not always, but usually.
I like it because I can touch lots of different areas (software, network) while doing a more methodical job. More detail oriented. It's not for everyone, but it is enjoyable for us.
Steve Jones