Let’s say that you are a mountain climber and you want to buy a rope that is half the price. Half the price seems good, since you can buy some more stuff with the money that you saved. But the rope is made of substandard material, that’s why it’s half the price. In that case you sacrificed your safety for money. Do you want that? Of course not! The same is true in taking driving lessons; you don’t get something cheap that gives you cheap quality too.
The idea here is getting the most out of what you actually paid for. If paying more means more quality then the money is worth it. When it comes to driving lessons, this idea goes to a higher level because we are now talking about safety. One mistake in the road could mean life or death.