It's a slight difference, but it's more about getting 500 people (unique or recurring) to give you (an average of) $30 per month. This could be automated recur

It's a slight difference, but it's more about getting 500 people (unique or recurring) to give you (an average of) $30 per month. This could be automated recurring revenue (like SaaS), or building products that are one-time or intermittent purchases with many customers. Or, you can try to get fewer customers at a higher price, or more customers at a lower price for some things (but that's almost always harder to make it work). It's also about building products that aren't full-time jobs in and of themselves, so you can have several products over time, that cover a range of concepts and audiences. This has the added benefit of providing you with diversified income, so you aren't SOL if a single product starts to lose customers. Ebooks are a common initial product, because they have a little less initial risk and are a little easier to start as a side project than a full-fledged SaaS product.