Srila Prabhupada speaks on charging fee
"But, on the whole the Gurukula standard should be free education, boarding, and lodging. People shall voluntarily contribute as far as possible."
Letter to Mohanananda - Calcutta, 13 October, 1973
" Actually it is the responsibility of the parents to maintain Gurukula. By taxing the Temples or taking loan from the BBT the parents are being allowed to avoid their responsibility. Before having a child the parents should see whether they shall be able to pay for their child's education."
Letter to Jagadisa - Mayapur, 22 January, 1976
Comments by Prabhupādanuga devotees of BIG & BIVC
"As we can see from the above quotes that the overall principle is not to charge any fees for education but it is parent’s responsibility to maintain the gurukula. So, overall the decision as to how much one has to pay for his child’s education is taken case to case based on the above guidelines given by Srila Prabhupada."
"As per Srila Prabhupada’s instruction the students energy (specially the college students) is being utilized to take care of the cows and growing food which is giving us enough milk, curd, ghee, sweets, grains, vegetables, cow dung for cooking etc. so that it can take care of the daily needs of the children, the teachers and the grown up brahmacharis who are living in that campus without depending on outside. Obviously the grown up brahmacharis oversee all these activities of the children who do it playfully. This way this institution for training children in K.C is being maintained easily."
For more details, please refer to Q.No.8 in the Magazine - Back to Srila Prabhupada's Gurukula