It probably makes little difference to the amount of traffic the site would be getting here as a result of the clicks, however allowing each topic to have it's own unique G+ +1 button would allow you to see what people enjoy sharing from Ozzu and if this topic is a popular one may encourage more to share it therefore increasing potential traffic further.yes its true try it
No much effect has been made g+ as i experienced.My site got more than 200 g+ but still i have not seen much hype in the traffic.Normal things are happening.
Google+ seems to be a good source of traffic to the website due to its features and growing use. It is a good alternative to Facebook.
My take on Google+ is that it will help with conversions... e.g. your site appears in the search rankings and it has more plus ones than other results nearby then surfers more likely to click eh? Whether its worth investing in this as a strategy I am not wholly convinced though.