Only 0.35% (176 out of 50,000 people) did pay for previous notes. You can Pay Whatever you want.
It took me weeks to create this roadmap with resources and I have made them AVAILABLE publicly for FREE so that everyone could benefit.
So, purchased these PDFs with a "Pay As You Wish" option for motivation so that I could continue sharing such notes.
Mazher Khan (Senior Data Analyst) - IIT Graduate