Thank you for mentioning it. I checked out the Steemleo Shop. I have not seen real eBooks so far, but there are ad spots on MSP Waves, artworks, recipes, and other things. Maybe one eBook is an exception. "To knowing what the heck Bitcoin is", written by Mitchell Jaworski. The eBook is currently available for $2.99 USD. If someone will put up their own fantasy eBook, then I will surely buy it with Steem or with Steem Dollars (SBD) (or maybe with LEO), if it will be around $3 USD.