Why Wasn't Meryl Streep on the Newsstand Cover of Entertainment Weekly?

I find this very strange (as have several of the readers of the blog.)

When I got my favorite magazine (EW) in the mail this week I was so excited to see Meryl Streep on the cover declaring her the "Queen of Hollywood." We all know that she was always the queen in terms of content but now, at 59, she's a bona fide box office star. Check out my piece from earlier this week.

So now it had come to light that the Streep cover was only sent to subscribers and that Twilight was put on the cover for newsstands. I know that Twilight is a huge hit and I am thrilled, but it had been on the cover only weeks before. Why did it need to be on the cover again?

And isn't it just ironic that the whole story about Streep was how she has become commercially viable and then it turns out that she's not commercial enough for newsstands.

Some body please explain this to me (or as Rachel Maddow would say- somebody talk me down.)

Here are the different covers (from last week- this week features Jennifer Aniston who is not known for her box office prowess):