If someone is ambitious, they can count the number of member names on the send message part of the personal pages. And not everyone is a member.
The number that bogled Roger's mind too much to remember was a quote from Max concerning the total traffic to the site in, I think, December 1997 - ONE MILLION hits a month. Dick asked Max what it is now, but has not got an answer yet. I don't know how they count hits, but it is definately inpressive.