You are part of The Problem.
This is a solo dev's venture, that has a relatively pure and straightforward goal. If you can't afford it, don't use it and pick one of the others.
Do NOT compare this with a B2C offering that has nothing to do with analytics.
Do NOT compare this with a B2B offering that's free and feeds your user's data into the parent corporation's advertising revenue stream.
Do NOT compare this with a B2B offering that is open-source, with a team of a dozen core contributors that has had a decade of development under its belt.
The goal is great, the design is sleek, but at the current price point (which is already lowered to $9) and feature set, it's just not worth it to me. For that price the tool has to provide more actionable data or other value.
There's probably a market out there, but most of that market is probably not the type of person you will find on hacker news.
But Slack basically is just IRC with pictures right? What extra value does slack give me other than a decent web client?