I agree with everyone here, like I've said recently, I don't want to start driving over about 40 miles from home for thunderstorms even if they are going to be incredibly severe, as you say money isn't exactly plentiful for fuel at my age either...
It's incredibly difficult to work out whether to chase or not, but if you don't and you miss something, you kick yourself for not going and the only negative really of chasing and not seeing anything is wasting fuel but you still manage to get out and explore the countryside!