How much is it worth?
well the entire set is about 100k coins, so thats about 10-30 mill gigas. Since it's +5, 30-60 mill gigas. It's really fracking valuable.
There are thousands of +5 sets, I know some people sell in marketplace (http://boutcheetah.zylongaming.com/index.php?action=marketplace) those sets with ~ 2000 BS.