A lot more. Let me explain.
The most bending servers out there are owned by people who are, let's say "new" to server owning. For others, the config has gotten out of hand.
Those people who are new to it, have probably failed balancing out their config, and they want a balanced one. The would delete it for that reason, and keep the custom abilities configuration of course. For those who failed to balance it after a longer time, they would simply do the same. Believe me, there would be many servers who would do this to balance their config. I think you should be thinking around 40% - 50%.