Well, with 99% of the racers with no background of electronics you can sell them anything with the right marketing story.
With capacitors there is a line of enough is enough so more will not help, but again with the right story more capacity will sell.

From what I hear is that my bank did provide a better brake feeling and a stronger brake and one guy made a personal best laptime on some indoor track. The brake I can understand it comes from the capacitor, the better laptime can come from any track condition but can also come from the capacitor.