Some do this all their lives.  But what is the result?  Have they derived any spiritual benefit? 
They only get the satisfaction that they have bathed in so many places and worshiped in so many temples.  But the real Yatra is the inner yatra of the soul.  That is the true yatra.  This is what we do in Sahaj Marg.  It is not necessary to go to the Ganges.  It is my mind, it is my faith, which makes even a bucket of water the Pavitra Ganga.  What is there in the Ganga?  Yes, of course, the puranas tell us that it is flowing from the right big toenail of Lord Vishnu.
 Yes, if I can do it I will go there, but does it mean that those who cannot go the Ganga are denied, or will be denied Mukti (liberation)?  Is every Muslim who doesn't go to Mecca denied his liberation?  It cannot be. 
Kabir has written that if the water of the Ganga is holy, then every crocodile in it should get Moksha!  A gross act cannot lead to a subtle result. Therefore Sanathana Dharma says, spiritual science says, sitting where you are, if you are able to invoke that divinity within yourself, link yourself to that with which you are eternally connected but which link you have forgotten, you can never break it.  Have faith in yourself.  So this is the great lesson of spirituality.  He who is the creator of the Universe is in the heart of everything that he has created. 
Look inside.  See him in your heart as the antaryamin, who is your controller, who is your creator, who is your supporter from within.  Seek him within.  You don't have to go wandering on tirtha yatra, spending money, acquiring diseases.  When we have lost touch with the within, we seek outside. 
Tirtha yatras originally meant the inner journey of the soul through various points, the charkas (spiritual knots).  Our poverty of spirit, our lack of faith, makes us happy that , "Yes, we have done it."  The Muslim is happy that he has been to Mecca, the Hindu is happy that he has been to Badrinath, and the Christian that he has been to Jerusalem, perhaps.
  In the spiritual journey it is not the travel of the body that takes us to the goal.  It is the Soul which has become imprisoned in the heart that has to be made to move; and then to go up point  by point until the destination is reached.  This is the real Yatra.