How to Improve Team Builder - What do you think?

I really like Team Builder because it lets you pick what you want without worrying about calling a position or toxic players. It can be frustrating however to wait x amount of time for a certain role to be filled while in Team Builder. What if League implemented a system where you gain more IP for playing a role that is in high demand? The higher the demand for that role, the higher the reward in IP. It could be a good incentive to get people to play a role other than their favorite and it could make finding that last player a lot easier. I don't know how much of an increase in IP it should be but I do believe the system would be beneficial. Please let me know what you think. :D