Why Does The Masters Tournament Need Your SSN In Order To Sell You Tickets?

Reader Robert writes:

I guess I will never get tickets to the Masters, because I am not sending them my SSN.

“The deadline for 2009 applicants is July 15, 2008. If you are not on the Practice Rounds mailing list, and would like to be added for 2009, please send your name, address, daytime telephone number, email address and Social Security Number no later than May 1, 2008 to…”

Well, that seems rather intrusive.

Why do they need your SSN? Is this normal behavior for golf-types?

Tickets [Masters]