Well, I've just had this same debate somewhere else, about the benefits of parking nicks to increase room numbers.
Your pretty much right in what you say, people are attracted to people, works the same in the real world, people will tend to occupy the bars and clubs where the most people go, its human nature.
Keeping chatters is another matter, I mean 50 people in a room not talking wont encourage anyone to hang around, you need to have people greeting them, etc.
Of course, you need to get them through the door first, so yes, I am in favour of trying to up room numbers to make a room more attractive.