I'm trying to have an idea of how much can I earn as a network admin. I have a bachelor degree in Management (MIS), an advanced diploma in networking and have worked in IT for about six years (I've worked part time before that for another 5 years when I was young). About four months finally got an actual networking job where I only deal with routers, switches, firewalls, QoS, traffic optimization both a the branch-office and core levels. Although, I'm still learning, it seems that I will stay in networking indifinetely. Unless.
Unless there is a reason (and a chance) for me to do something else. In the next few years, I plan to get industry certifications and study advanced networking. But I have to pay my student loans as wells

So, how much [on average] can I expect? What are the chances of me moving to another IT area if my resume is full of networking experience/training?