Ask HN: Why did Mixpanel change its pricing?

This HN thread details their pricing in 2009~:

  0...10,000 points:          Free
  10,000...100,000:           $25
  100,000...500,000:          $100
  500,000...2,000,000:        $200
  2,000,000...10,000,000:     $700

Since then, they've gotten rid of the $25/mo plan, and increased the relative prices of the other plans.

1. Is this a sign that Mixpanel's sales team rather spend time closing the bigger deals than worry about the small ones?

2. Is Mixpanel adopting the same pricing model as Heroku? That is, encourage startups to use it for free, and then charge the ones that grow into big companies?

Is this a good pricing strategy for "infrastructure" companies (API's, cloud services, etc.)?

~http://news.ycombinator.com/item?id=942053