Well I think that alot is already covered in this post. I'm a member of 2 local chess clubs (one is about 2 miles away and the other one around 4 miles or so). About a year ago I rejoined these clubs after being gone from them for 9 years and the clubs are for the biggest part identical to the conditions that Scarblac mentioned.
These clubs have around 30 members each including 5-10 and 4 people of around my age. That makes them have almost 50% young players and 50% seniors.
One of the reasons I play in these clubs is that online play doesn't compare to the joy I get from playing OTB:
- A real chess board and pieces that you can physically grab and move around;
- The pressure;
- The expressions on my opponents faces;
- The adrenaline in a critical position;
- I get to meet a lot of nice people that I can talk with about everything.
When I play online I don't have these things. Because of that I tend to concentrate alot less on my games and play much worse chess. Sometimes I even get disgusted of myself in online chess because the moves are simply horrible.
Another reason is that I've got WAY too much time on my hands that I really need to spend on something.
It's just like many people have played or know how to play billiards/pool. But few of those join a league or enter into a tournament.