For some odd reason I find this interesting - I got an email from United Airlines (UA) in regards to my frequent flyer status. They were advertising a new Sony super small laptop.
If you buy the laptop you get X# of more miles via the promo and this can get increased if you sign up for their VISA and use your new UA Visa to buy the laptop.
To make this even more appealing, all these new miles can get doubled because of my frequent flyer status, and then at the end of the message there is a reminder that I can use my "extra earned" mileage to buy Sony online music.
A 'nice and neat' marketing approach IMHO.