So, after reading through these posts, I decided to ask USBC itself. I wrote:
Hi,
There seems to be this big debate going on about using an autographed ball. It is known that a USBC rule bans the use of markers on a ball, but why?
And following is USBC's response:
The use of a marker on a bowling ball would be considered a foreign substance on the surface of a bowling ball which is against USBC specifications. The surface of the bowling ball must be clear from all foreign substances to protect the integrity of the game. There is no grey to the rule, it is black and white to make it easy to enforce.
Should you have any further questions, feel free to contact us.
Sincerely,
Michael A. Spridco
Senior Director
Rules/Bonding