Their event pricing would require you to log something on the order of tens of millions of events to get at a 10k monthly bill. If you were turning it on in a high-volume environment, how did you unexpectedly run up a 10k bill after doing the math in half a day? Something about this doesn't add up.
We have a popular website, and this was the first analytics product outside of Google Analytics that we reached for. We used several other metered tools that didn't charge extreme amounts for our volume, so this was our very first real surprise.
They're selling to websites with low visitor counts, expecting people to sample small subsets traffic, or catering to large orgs with huge budgets for this.
The out of the box behavior for new customers should be to downsample until a flag is turned on or to set billing thresholds.