My 'real name' is unique, and I've grown increasingly nervous over the last few years as to what sort of footprint I'm leaving whenever I use it - at Amazon for example. Anywhere I leave my real name, it would take someone about five seconds to take that name and figure out exactly where I live, and while my name might be unique, it's not intrinsically unusual or 'weird'. So yeah - I'm not inclined to leap into any service that might require my real name, even though I suspect that from an advertisers pov I am prime material because of our family income. People who want my real name had better be offering me something that I really, really want, and Google+ isn't looking like that something.