I'd be interested in membership, but I wonder whether it makes sense for people living in Europe....
Well, there's Zymurgy. I'm not sure if there would be an extra charge to mail paper copies to Europe or not. And you would have access to the e-versions.
Discounts on books and other items from AHA. Again, might be extra charge to send to Europe.
Attendance at the AHA National Conference and the Great American Beer Festival. You could do a vacation around either one of these and spend some extra time visiting craft breweries here in the US.
Just a few reasons off the top of my head.