Why pilot training is so expensive?

Concerning the following topic, various factors rely on affecting the topic.

Firstly, the increment of airplane fuel's price proportionally increases the training cost. Similarly, the insurance fares and taxes of airplane, maintenance cost, cost of the airplane itself support in raising
the pilot training.
The demand of more salary by tutors has also been a reasonable factor. Likewise, the policy of FAA to train for more hours has respectively assisted in making pilot training so costly. And engagement of hangar fees, landing cost, pilot accessories fares  has made it more expensive