Being in a clan requires being available for training sessions and matches, wich translates to sacrificing your social/private life sometimes.
Can be done when young (under 25) with loads of free time, but when you want to relax a little and then go to bed but it's training time...

Or, you could get in a fun clan, where basically people play scrims from time to time just for the fun of it (getting their arses handed to them

) and shares server bills and other stuff.