$10 Dollar Rebate After You Spend $15 At Buy.com

I recently got this in the mail with a recent order. It seems to be worth the try to get back $10.
Rebate Link

This is what I got:
Magazine Rebate Form
Included with your purchase of $15 or more from Buy.com is a one year magazine subscription valued at $10. If you wish to decline the magazine and receive a rebate for the stated value, please print and return this form with a copy of your receipt as proof of purchase.
This form must be postmarked within 30 days of purchase.
It doesn't seem to have any expiration date, so seemingly this can be used many times. Try it out.