This is a good idea if @XDinc wanted to put the time into it. Personally you can somewhat mimic this by adding less posts needed for first levels and gradually add more needed as you go but would be great to automatically have that as an option to gradually increase it. I'm not sure how much work this would take and kind of seems like it might be hard but a fantastic ideaLevel system instead of fixed stars:
Do you know if it is possible to convert this to use levels (1-100) instead of stars. Have an algorithm to make every next level require more experience needed. Display your current level in the postbit with a tiny current experience to next level underneath that current level. If you hover over the bar you will see current experience / total experience needed all in numbers.