While I do agree on following a solid mid/long term strategy to generate sustainable growth, a Startup can often benefit immensely from hacking an unconventional marketing channel at an early point in its trajectory. If that doubles or triples your signups even for a short time, it can be immensely helpful to get investors to take you more seriously while you're grinding out the longterm strategy. It also helps to get feedback from real users while you're still in the development phase.