Adding to the (failed) options and some considerations.
My mean reason for a second account is to connect to other services like Podio, LinkedIn, etc. It's something to have personal notes shared with Evernote. Personal is personal, so I don't want to share those notes with others or with other business application. However in the spirit of one source and simplicity I AM keeping personal and business in one Evernote account.
If I connect with other services like Podio, LinkedIn, Google, etc. these application want to get access to all my notes (obviously). But I want to be selective and share with these notes only my Business Folders. That option is NOT available.
So I explored another option: I created a second Evernote account (let's call it My Business Notebooks account) and I shared all my Business Notebooks with this new Evernote account. It works nicely as many of you already opted to do as well. HOWEVER, the catch is that these shared notes do NOT pop up in linked applications! And that was the only reason why I created the account in the first place!
So a second 'empty' account with shared Business Notebooks works nicely to keep all personal stuff away from business environment (although one cannot add notes to the shared Bussiness Notebooks - feature request 1) but it doesn't work to share these notebooks to other applications. (Feature request 2)