If that's the sort of story you like to write and to read, don't change because it doesn't suit some people. As you've gathered, some people like a good thorough buildup, so write for them, not for the ones in a hurry.
One of the best things about a free self-publishing site is that you never have to trim your style to what some editor believes will sell.
The best piece of writing advice I know comes from Herman Hesse: "Write the book you want to read." Not the book you think someone else might want to read, who might have quite different tastes from yours.