Some of us write simply because we can't not write. Ideas grab us, move us, and demand to be written. We strive to make it as real as we possibly can, to improve at our craft every day, hopefully to make it into realm of literature as well as entertainment. We want to craft an entire world where places and people are so real that reader doesn't feel like he's reading a book as much as he is going to another place. In lofty world of literature that we strive for, reader will still think about book after reading that last page. It's our gift to reader, something to take with him. Given sufficient skill, this can even happen long after we are dead.

Then we learn that doesn't sell. Oh, there are exceptions. Some novelists make a living by consistently writing quality literature. But, there are quite a few best sellers who have no such goals. They write for money, and they make it.

Even writer who has written great literature has trouble marketing it that way. We have to look at our "target audience." Who will buy this book? Let me see, our heroine survived spousal abuse, so there's an audience. There's a suicide, so we can get bereavement crowd. Where's setting? We can get a local audience. The hero's a cop. Maybe teen boys will go for that. Nah, too light on action. But there's a romance. Maybe we'll market to romance readers. Give hero bedroom eyes and pass him off as a romantic hero. Yeah, that might work.

But if you want to write to get rich, even that's not enough. Nah, time to think about your reader is before you write book, not after.

Throw in lots of gratuitous sex, preferably extramarital. One (and only one) character who flirts and is sorely tempted and walks away from "love" to remain true to his wife.