30×500 is a formula, a simple bit of arithmetic. Before we created 30×500 we noticed that a LOT of our very talented friends were stuck—miserable—at startup and corporate jobs they hated. They looked longingly into the world of having a product business of their own, but were faced with the chasm of how to replace their existing income. If their income was something like—say, a healthy $180k/year salary—they could never imagine themselves building a business to replace that. Until we broke it down for them: you only need to deliver $30/month worth of value to 500 customers to gross $180k/year. That's 500 customers, on the ENTIRE INTERNET. When you see those numbers, success as a bootstrapping solo entrepreneur starts to look so much more achievable. Hence, 30×500. Of course, both of those numbers are variables. Deliver $100/month to 150 customers, same outcome (with less support!). Introduce a second product, especially one that your existing happy customers are likely to buy, and the numbers start to… well, stack up. That's why this little bit of math is at the heart of Stacking the Bricks to build your business.