Two interesting aspects.
1) More romance novels means that there are more women reading eBooks, which has been a rather male-dominated field for its first run of about the last ten years. This did indeed begin to change when Amazon offered the Kindle but I'm waiting for the day when there are more female ebook readers than male.
Then eBooks have become mainstream.
2) eBooks are discreet: You might even read a hardcore porn novel during a bus ride and your neighbor wouldn't necessarily notice.
This is a privacy which might also attract more readers to consider eBooks. "What you always wanted to read in public but never dared to open".
