“My theory on business is that if it’s so smart and so easy, then why didn’t someone else do it first. Unless you can answer that don’t bother.”
Because human nature is a powerful force. Many people are simply too lazy to actually pursue even what appears to be a simple easy endeavor, preferring to instead rationalize why it’s so hard, it won’t work, “if it’s so smart and so easy, then why didn’t someone else do it first”, let the next guy do it, etc.