Definitely - we offer a one month free trial of the lowest tier plan (2500 users/month).
For orgs like us, your pricing seems rather brutal, as we're probably much lower in pages/visit than an "app" type website. (We're at ~10 page views per visit, average)
Also, content-heavy sites have different analytics needs from applications. It'd be interesting to see where Heap fits in, but most of the analyses you can run in KISSMetrics, Mixpanel and other app-focused analytics tools aren't of much use for news organizations.
P.S. We used to have Omniture, and switched to Google to save $.
Something like
* Users 1-2,500: $0.01/user
* Users 2,501-20,000: $0.0625/user
* Users 20,001-80,000: $0.0583/user
might be a tad more intuitive, especially if you listed the top-end price along with that.
For analytics, simple tiers (without pro rating) should work fine.
Someone below said that you should base your pricing on cost - I completely disagree. You should absolutely NOT look at cost when you put pricing together - rather, you need to ask your customers about the value of what it is you're providing. For example, Heap will be saving the time and hassle of deploying a generic solution on a server and the time of customising it. Plus Heap will be improving their product every day whereas the self-hosted version would need a developer to add new features. These sort of things all add up - you'll be surprised what you find out when you ask your customers.
Pricing is hard. There are a lot of good articles and discussions on HN if you do a bit of searching.
Good luck. Heap looks good