This is a very effective way to make some online residual income. All you have to do is tell a couple of people to visit the website development company website and go through their terms and conditions. If they sign up for the services of the web development company, you will get paid a commission for bring them the customers. But the commission doesn't end there. When the people recommended by you bring in their share of referrals, you will still get paid. And this chain will continue from each referral to referral.
Also, how long is your investment horizon? Is it really that important to you to project out to 30 years or is 3λ years sufficient along with a terminal value that represents the expected NPV beyond 5 years? Usually this latter approach works best and looks the most credible to potential investors. There are numerous ways to calculate terminal value including multiples, current market values projected forward, and round guesstimates. Obviously these decisions are affected by your personal preference and the type of investment for which you're calculating present value.