Twanger said:
My $0.02 ...
2-4 People - go monohull
5-8 People - go cat
More than 8 - you're nutz!!! <img src="http://www.traveltalkonline.com/forums/images/graemlins/jester.gif" alt="" />
Count me in as nutz then, we had 9 on a Moorings 4600 one trip. Really no worse than 8 was.
I also think you can do more on a mono, but you just need to go bigger. The 50-55' mono's can easily accomodate 8 people comfortably.