Some of us has a life. We support a lot of stuff but we don't always have time to check them all. I tham gia it so I can keep track of the spot (its better than being unsubscribed).
Are bạn asking "why tham gia so many", hoặc "why make so many"? The ones I've made I check on quite often. The ones I've joined- well, I get around to them eventually.
I sometimes forget to check all the các câu lạc bộ I'm a người hâm mộ of LOL – Liên minh huyền thoại Plus if the club isn't active, I'll forget about it eventually.