Good question..... you can ask part of that question to @@Dirk Diggler. He took forever to join the clan and had played cod2 forever. Many like that.. @@Shamu is another. He still refuses to get tags.. that prick.
A recent convert is @@Mad Ha_ter. He is another who took forever to join. Ask him why was it just last week he got his tags. lol
As for some the case may be they have not taken the time to get to know other players or admin for whatever reason. Talking in game is a great way to get to know folks and if people don't talk could be part of the problem. Could be asshole members who wont let them talk as well.
Could be language problem or someone is shy, or an ass in game. Unlike me.. i am only a ass in the forum. It could be they won't take the time to visit the website. Many players who wont get to know the admin's wont ever become a member. So they have to put some effort into it.
Welcome enjoy.. now for some cod2.