One of the best quotes about moats, friction and pricing comes from an author:

"I wrote a book and there is an epub version of it. I have the epub version for free on my website. There is also an epub version on Amazon and there is costs $4.

You might think that nobody buys my book because it's available for free.

You would be mistaken. LOTS of people pay for the book on Amazon and almost no one downloads it from my website.

Why?

Very obviously people are lazy and they are willing to pay the $4 to just one click deliver the book to their Kindle."