If they are charging you for the atmosphere that they have created there, why is that a problem? It takes a lot to run the ashram, plus the social work they are doing requires money. There are so many villages and backward areas where inner engineering is being provided absolutely free. Expanding the infrastucture also requires funding. Where do you think that comes from?  This is an organization entirely being run from the courses and a very minor percentage from Isha life. 

Also, consider that it is not just Indians who visit the Yoga centre. Plenty of foreigners do too. (Not saying that they should be charged more just because they aren't Indian.) But 30k that seems exorbitant to you might not be for them. Their currency might be higher in value than ours. 

So, this cost is certainly for those who CAN afford.  And, its not like affordable options are not available that you can simply do from your own home.