You are not just a writer, you are a business person. A business person doesn’t just wake up one morning and create a product or service without considering whether the market needs the product or service. A business person must ask, “will people pay for this product or service?” Similarly, as a writer and business person, you must also ask yourself, “Will people take out their time to read my story?”, “Does this story educate, entertain or have an ‘audience value’?” If the answer is a no, you might want to write it in your personal journal where you alone will see it.
Hmmm.... I agree with the overall tone of your article but not this bit. Writing is an art, therefore it involves a level of creativity. For sure, you want to make money out of it, but writing above all is an aesthetic choice you make. If your only purpose is to write with a certain type of reader in mind, you're not writing, you're preaching. That's different. :-)