Srimad Mahabharata provides the key note of ill effects one would derive by obtaining knowledge on free of cost and thereby implying the importance of Tuition fees.
SRIMAD MAHABHARATA – AADI PARVA – PAUSHYA (UPA) PARVA – PART 3(E) – IMPORTANCE OF GURU ARTHA
“Soota continued, “Thus addressed, Uttanka replied, saying, “Let me do something that you wish, for it has been said, ‘He who grants instruction (i.e. knowledge) contrary to Dharma and he who receives it contrary to Dharma, one of the two dies, and enmity springs up between the two. I am desirous of bringing you some honorarium (Guru Artha in Sanskrit) due to a Guru, as I have received your leave to depart.’
“His Upaadhyaaya (Veda), upon hearing this, replied, ‘Uttanka, my child, wait a while.’ Sometime after, Uttanka again addressed his Guru, saying, ‘Command me to bring that for Guru Artha, which you desire.’ His Guru (Veda) then said, ‘
“Thus directed by his Guru (Veda), Uttanka addressed his Upaadhyaayini, saying, ‘Madam, I have obtained my Upaadhyaaya’s leave to go home, and I am desirous of bringing something agreeable to you as Guru Artha for the instruction I have received, in order that I may not leave as his debtor. Therefore, please command me what I am to bring.’
“Thus addressed, his Upaadhyaayini replied, ‘Go to King Paushya and beg (Bhiksha in Sanskrit) of him the pair of ear-rings worn by his Queen, and bring them here. The fourth day from now is a sacred day, when I wish to appear before the Brahmanas (who may dine at my house) decked with these ear-rings. Then accomplish this, O Uttanka! If you should succeed, good fortune shall attend you; if not, what good can you expect?’