No credit card required
Browse credit cards from a variety of issuers to see if there's a better card for you.
From my understanding of the article on Doctor of Credit I think it may be able to be used more than once but it has to be an email referral simply having the link doesn't work and it will work on numerous cards not just the Platinum.
Seems very narrowly targetted. If you sent me a normal referral I'd think "Who do I know who qualifies and would be interested in an Amex?" while this would make me think "Who do I know who attends ticketmaster events?"