It worths, it worths, and quite much.
I am using the "surface" of my nail, meaning I touch the display with the surface of the nail, not with the tip, and it has improved scrolling in general.
Thank you.

NOTA BENE: Revlon nail varnish has improved performance in nail-surface scrolling technique! :-) I KNOW this advice item will not be helpful to half of the forum (yes, I was joking).