We've grown Atlassian 3x over the last 3 years, all by following our current model of reasonable, transparent pricing, and selling in volume to thousands of customers around the globe.
There are things we want to improve of course (around our products - we're never done with improving them), but we don't plan to change our model.
We spoke at great length with Accel Partner about this. They like us for what we are, not what we could be if we changed.