This is just one of the reason that the e-book is so great. Anyone with a little time and patience can create the book that they enjoy to read. On the other hand most people and I don't mean Mobileread type people, think that this is a waste of time, my spouse for instance.
But I think I'm still right, there should always be a break after a paragraph.
Remember the more breaks in the book means ultimately more pages for the printer to print making them more money.
And thanks HarryT for the wonderful tutorial for book designer.