In answer to:
Great! I have never thought about it before.
Yes, we can use a bookmark, anyway reading for pleasure is not alway easy if you have to work and/or study, and short chapters could psicologically help us to plan our reading time.
BTW, one thing I always loved are the chapter titles; not all books have a title for each chapter, but I think they are a delicious anticipation of what you’re going to read, like watching at the menu card at the restaurant. It’s like blog’s post, isn’t it?
The question is: why so many writers use long chapters? It could be a style choice, of course. Sometimes, the author could desire to give a specific rhythm to the story; it’s like movies: the director could choice to show the facts in a few minutes, or - au contraire - to give the spectator the time to reflect while they happen.
I do think there’s a rhythm in any story, and this rhythm should be given by the author. A pause in reading, sometimes, could be like a second of silence in a musical composition: it’s void, but important.
At the other hand, I think very often (not always) there’s no logical reason to trunk a story in a point or the other. Sometimes it really seems casual. What do you think about?
Another reason for chapters’ length could be a technical one: expecially when you are not famous, the editors use to ask one or two chapters to evaluate your work. Then, if you want to show your talent, you can’t give him just ten pages, even beautiful.
I love chapter titles too. I think in next years (10 or 20) the way to edit books will change according to blogs. We need the time to explore the concept and the way we’ll edit blogs; what’s the best way to do it. When blogs will get mature, I think that editors will incorporate some ideas in traditional books editing like chapter titles 
Many authors say: think simple. Create short sentences with short and meaningful words. I thing that this “minimalist” vision could be applicable in a more global view: the chapters.
