In reply to CameronDuff14:
As a (self-published) author yes I make more money if you buy directly from me.
But would I make the sales via climbing shops without a distributor? Not without doing a LOT of leg work myself. They don't take that much when you factor in what they sell them to the shops for. It's nice to have them in independent climbing shops as I like to support them where I can.
My book sales in various countries (including the USA) are via Amazon. They take their cut but they print and ship them from the USA (to use that example) with a bigger carbon footprint. That saves me having to pay for a print run and ship it over there, or find another printer and use a fulfilment company over there, who will also take their cut.
The main trade off is increased volume versus the % you make. It averages out over the different ways of doing it ime. I make more per book I sell, but I sell less. I sell a fair few on Amazon, but make less per book. Each month it's about the same amount.
Distribution of climbing books in Europe and USA is surprisingly difficult. Not because there is a dominant player controlling things, but because there isn't anyone doing it very well, from what I can see.