I race motocross at a pretty serious competitive level.
It's the same in any sport, just like the earlier said soccer cleats.
The more you pay, the higher the quality and more testing put into it.
When you get to the professional level, more aftermarket and more reliable parts are necessary. The fastest riders in the world is going to need a more reliable and faster bike than an amateur just starting. That said, you always see spoiled kids in every sport who always have everything handed to them, right? Just run what you like and the better you get, the smarter it'd be to invest in stronger parts so you don't get hurt.