I believe that's the end goal. The more participation, the more the club will thrive. However, there are things that can inhibit or foster participation.
I guess I throw caution into the wind, but you don't really know "coolreefer365" but he has a coral for a price you want. Do you throw that caution in the wind and find out what you walk into, slimy basement or upscale condo. I've been to both and they both were awesome dudes. However, my GF is much more skeptical of people coming over. I guess since someone signed up for a free forum, they're cool to come into my house...
That's why I think having events where you get people involved, taking pictures, having raffles would be a great way to put faces to screen-names and you can spend more time getting to know your local club members out from behind the glowing screen. Then post pictures, raffle winnings back to the forum and people will be like, "crap, all I had to do was show up and I was entered into a raffle for multiple items. Why didn't I go!!!!"