As a newstand purchaser, I am paying full retail and have to go get it. Subscribers get a cut price and have it delivered. Your benefit is convenience, one time purchasing, and you don't have to enter a code for access to the web content every month or so. That's my polite answer, which is considerably longer than my first and subsequently edited response.
By the way, welcome to the forums. Nice first post...
edit I hadn't realized that the Bonus sections weren't included with the subscriber issues. That's a bummer. /edit