I've worked as a vet tech for the last two years. I have no formal training (not certified or registered). But around here, registered or not, with a year+ experience vet techs make from $8-$13 dollars an hour, depending on which clinic you work at. So, you're not looking at that big of a salary. But in the bigger cities, like Houston or Dallas, basically ones that have actual animal hospitals with various specialties, you're looking at more like $15-$20 dollars an hour if you're registered.
So money wise, you definitely could have a better field, but as far as the actual job, I absolutely love it. I couldn't picture myself doing anything else at this time. If you work for a good vet (which I do now, worked for a bad one though) that is willing to teach you and explain the why behind the what and how, it's amazingly rewarding. I feel like I learn something new everyday and really do make a difference in the patients' lives. I'm currently working on my pre reqs for vet school, so I feel the experience really will help me down the road.