Dad's Math: Starbucks Gold Card

Sometimes it proves very helpful that my dad is an accountant. Here's his take on the Starbucks Gold Card:

Break even on the card is $4.81 purchases average per week.

Pay:
$25.00

Purchases:
$4.81 times 52 weeks in a year equals $250.12 purchases per year.
$250.12 times 10 percent equals $25.01 savings

So.... if you think you will buy $250 or more at Starbucks in a year ($4.81 average per week) the Starbucks Gold Card is for you. :)

Brother Matt's comment: "Already got one! $4.80 per week is chump change."