Storm chasing isn't a career for 99%, it's a side hobby. As a meteorologist who lives in Kansas, let me say that chasing is a great thing. I love every aspect of storms and would much rather be a short, but safe distance from a tornado than sitting at home hoping it doesn't hit me!
Most storm chasers don't put themselves right in front of a tornado...yes, it can and does sometimes happen, but rarely if you're really just tracking alongside and not trying your best to get that amazing video for $$$.
I'd say this, unless you can properly identify key storm structures and how quickly they can evolve, one shouldn't do it. It's really only for the trained eye. My only regret is that I don't get to chase much these days and I'm right in the best spot to do it. I get to send them out, but not go myself. Oh well...one of these days I'll get a good road trip in and do some more.