If you're at the stage of your company's lifecyle where you're in YC, then all metrics of users. Users, users, users.

"The first lesson of Silicon Valley, actually, is that you only think about the user, the experience. You actually don't think about the money. Ever."

Ryan Howard, The Office, S07E09

I know what you mean, but every time someone says something like this, that quote comes to mind.

I have an idea, why dont you read the fucking essay, and come back and let us know? He gives crystal clear guidance and its pretty smart.

Alternately, since you're obviously a ninja rockstar, you could show us all what a great entrepreneur you can be by disregarding his advice.