Dude, all,
I am involved in training new intakes of Dispatchers for a handling agent, and I would always rather have staff to train who already know how an airport works. It allows me a lot more time to get involved in the specifics of Ops/Dispatch rather than having to start from square one. My advice is to GO FOR IT! The hours are rubbish, the money is not much better, but once the airport bug bites you, you're hooked!.
Good luck...
PHX