In the West, we are not used to this concept of daksina. In India, it is part of the culture and tradition to honour the teaching and the teacher for sharing knowledge and practices.
Can we not put a price on what is priceless? for knowledge or practices that allow our hearts to relax?
We can give as much as we can, whenever we can, in order to express our gratitude, according to our situation and the means available.
It is said in the Weda that Phalam, the fruits of our study, descend and take shape in the Self at the time of Dakshina. It is a practice that makes you free and that you will feel as such, from which you derive a great instantaneous fullness: Purnam.