The G8 Summit - What's it really about?

What’s this G8 Summit business really about? If it were really about a meaningful meeting between world leaders in which some real work could be done, why does it need to take place in the full glare of the media spotlight? It seems to me that, rather than advertise to world terrorists where and when their targets will be sitting down to lunch together, they should be meeting in some military bunker in the middle of nowhere, with the world becoming aware of said meeting only after it had taken place. If we are to take this whole security thing seriously then surely by opting for the full-on Gleneagles option our leaders are not only putting us all at risk, but also making a mockery of all these so called ‘security measures’ they are taking which are now beginning to affect our daily lives. Apart from the obvious money making opportunities of the chosen option and the vast posturing potential for the participants, am I missing something?