Originally Posted by jerry305

At the Starwood SPG website, there's a link that says "Add someone to your account" to earn 1,000 bonus Starpoints.
However, there's an annual fee of $50 per supplementary card. So to earn that 1,000 points, you're paying a fee that is higher than the price of buying 1,000 Starpoints (US $35).

The T&C says:
• 1,000 Bonus Starpoints will be awarded for each approved Supplementary Starwood Preferred Guest Credit Card requested through the link on this page. Bonus points will be credited to your Starwood Preferred Guest Account up to 90 days after the application is approved.
• Maximum 9 Supplementary Cards.