I think Skype only allows five people at a time, so that's not an option. Also I've looked all over their website(s) to verify if this is accurate as it is mentioned in the Apple OSX info, but since they are promoting themselves as a business tool I can't imagine that five is the max.
But I am finding it hard to get confirmation on this. And I need to speak to a real person in case there are technical problems, which I'm not finding via Skype.