I run Improvely (https://www.improvely.com) and W3Counter (https://www.w3counter.com) alone. I initially developed Improvely in 2012, and W3Counter in 2004. They, along with some other side projects, are how I have made a living for most of the past 10 years.
Hey, thanks. I remember the old SitePoint forums fondly, and other people there inspired and helped me get W3Counter off the ground. I occasionally check up on people I knew from there as well... Zach Holman (lo0ol) sold Good-Tutorials and became one of the first engineers at GitHub, Josh Pigford (shpigford) went on to make Baremetrics, Roger Stringer (freekrai) made Flybase, Josh Catone (bleys) became a writer then executive for RWW/Mashable... SPF was our HN before HN.
I miss the old SP days, I wasn't very active as a user, but I did a lot of business there buying services. The redo messed that all up and since I haven't had as good of luck finding talent. :/
It's freemium. People pay between $5 and $50 per month for extra features. It's really not hard to compete with Google Analytics (especially when you start before GA existed). There are a ton of large companies making millions and billions in the analytics space.