It all depends on your financial situation and tolerance for risk. If you don't mind risking thousands of dollars [and who knows how many man hours] for every tiny error in judgement with the way you set up the controls, tune the engine and fly the plane, go for it.
If you are successful learning the hobby this way, you will probably be the first anyone has heard of..............
.....well who knows, some Son of an oil rich Sultan could have mastered the sport after stuffing a few dozen RC jets?