Firstly, let me state this is not an advertisement for any CC - it is a topic about CC owners inviting every single player they see.
These people are "poaching" players from CC's which they are happily in, either annoying the person who receives the invite or annoying to the people in the CC, who often have worked hard to get their status as a good CC, without out-of-the-blue invites.
Also, these people sending the invites think success, and being a top CC, comes with having lots of members. This is far from the case. A great CC comes with integrity, a homely feeling, and most importantly, active members. The way to achieve this is putting a topic up in the forum, inviting your friends to come and join, then slowly - but surely - building up your club, as they talk with their friends about joining, etc etc.
Alas, this will probably never change. There are guys who think they can waltz right in, start a CC and by inviting everyone in sight, get an active CC going.
There are people out there who do this regularly, and although (as far as I know) there is no rule against naming and shaming CC's, I will not be naming names. But you know who you are, and if you are doing it, please stop.