Though travelling by train is time consuming, one of the major dangers of travelling by train for a person who is fairly well off, is the danger involved. Many of the travellers in the train are not middle class and are easily provoked, without a valid reason.
With intelligence and security agencies involved in large scale microchipping of indian citizens, a single person with powerful enemies is very vulnerable to being physically attacked when travelling by train by the lynch mobs. Unlike airports where there are a lot of CISF personnel who can deal with the irrational and hysterical groups who attack harmless travellers at the slightest provocation or without any provocation, in the train there is no one who can help a harmless person who is being physically attacked.
So those who have had an unpleasant experience for train or bus travel, will prefer to travel by air, though prices are significantly higher and though a person has limited funds