Gutholz, you've been around a long time. Do you remember when all the big endurance leagues were dominated by the FZR? Leagues slowly increased the ballast until it got to around 26kg, then the XRR dominated.
When skill is roughly equal at the front of the grid, even a little bit of ballast can make a world of difference. When there's a huge gap in skill of course it doesn't matter. You don't use ballast to balance the entire grid, just the people who can get the most out of the car.
I don't mean any disrespect to you, because I certainly don't get everything out of the cars either, I'm usually 0.5-1.0 seconds off the top few. Even so, I can still appreciate that seemingly small differences make things much more even. And for those who are going for an overall win, 10kg can absolutely make the difference between choosing one car or another.