What happens if I'm a smallish site and suddenly get slashdotted / DDoSed? Will I be charged thousand dollars? Is there a way to cap monthly costs?
But we plan to offer caps and the option to auto-sample if you exceed your tier.
Also, I assume anonymous visitors are also users?
Seriously though, for my purposes I'm much more interested in tracking events of my current users. Obviously for you conversion funnel analysis is important, and thats cool, but realize everyone has different needs (and budgets!)