Thomas,
I believe there were about 50 chapters people about about 100 devs. I'm not sure why the mean travel distance would be lower if you include everyone - there were people from all around the world there, many having travelled further than the average board member.
Actually, I'd be happy if you were right (and you probably are!) - it shows, that lots of people had the motivation to come to this "excursion".
Cheers,