We actually immediately cancelled our paid plan and went back to their free tier. To match what they provide in their free tier (20M events), the cost is $2,289 USD / month (no thanks). https://mixpanel.com/pricing/plan-builder/?dcv=growth
So basically we can either pay $2,289 USD / month, or pay nothing, and still get the same number of tracked events. Just bizzare... We've moved on, and I've been on the search for an alternative ever since.