If Aikido were beneficial to everyone then everyone would do it and no one would ever quit. Since not everyone does Aikido and most people quit I'm willing to bet the Aikido experience wasn't all that beneficial to them or even beneficial at all.
Pretty simple actually.
Yeah, seeing loads of beginners join up every month, and 90% of them quitting in a month or two.. or three... or in some cases four... just gives me that warm egotistical feeling inside that is one of the reasons why I come back.
There, I said it