I do have an account but it's just the free one. I'm not sure what the traffic limits are for the free account but I know a couple of lifestyle mags that have a high readership and run on the free account. Just means you get a side bar with related issuu publications on the viewer.
I'd recommend everyone signing up for the free account even if you don't want to publish anything as there are loads of portfolios and inspiration stuff on there you can bookmark and add to your 'bookshelf'.
You can see the how the embed feature works on my site
Graphic Design by Russell Hall; branding_logodesign_interiors_magazines