I just subscribed and thought I'd share a little math I did in case anyone is interested.
On the webpage it shows a value of $343 for the subscription, which is more than 10 CPM and I was quite excited. I then looked up the price of subscription at wsj.com. It's something like $59 for 28 weeks or $99 for 58 weeks. I then worked out a value of $74.71 for the 39 weeks subscription, or 2.264 CPM.
Since I like the WSJ and was able to get it without money out of pocket, I subscribed