Can anyone tell me if there is really any difference between a something like a $100 radio and a $550 radio?

e.g Futuba 2pl and 4px

What I mean is how will a more expensive radio help you to become a better driver?

I cant help thinking that there is really only 4 actions forward, backwards, left and right, surely its more about getting used to the radio you have and learning how to manage the tensions within the trigger and wheel?

I mean the difference between a 17.5t and a 6.5t motor is undeniable, all other things being even the 6.5t will beat a 17.5t and just not sure the same holds true for these expensive radios...