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Services like Flurry will get you more sales. They'll help you get a better product. They'll let you learn what features your users use, and which you should kill.

If you don't know how many of your users actually use your application, and what they do in the application - you'll fail at product management. You'll add features I don't care about because you won't know otherwise.

At the very minimum you'll want to know:

• Total active users this week/24 hours
• % of users that visit each of your views

From this you can learn what people are doing and help to facilitate that.

What does it mean if you have 25,000 users, but only 1% of the users keep coming back? What if you have 2500 users and 100% of them come back each week. Which would you rather have to deal with as a product manager?

An interesting thought: How do you reach inactive users?