Apart from using the donation word for fees on their website, these nithyananda people get all money in the name of donations.
One of my friends happened to join this kalpatharu program that was held in August 1st, in Trichy, Tamilnadu,India.
I was shocked to notice that they give receipt for the 1000rs they are getting for the program as donation.
This is perfect cheating of government to escape service tax. By accepting the fees as donation, they are excempted from service tax since the donations are supposed to go to a trust floated by them.
Will try to get a copy of that donation receipt and post it here asap.