A few years back my friend and I had bootstrapped a simple SaaS product to over $30k/mo in recurring revenue with insane margins. We turned it into a bigger business after that, but I sometimes can't believe how much we made with just two people.
No sales or marketing spend. We built developer tools (still do) and just found really passionate communities that were willing to pay for things. We did spend a good amount of time on "virality" (just making sure we were utilizing organic growth on Twitter), and also tweaking and testing pricing models. We probably tried 5+ pricing models for new customers in a given year.
