Akin
I totally agree with the introduction to new players of the system, however it still needs to have a default on/off despite having an introduction of the system. However, atleast that would make people aware.
I have a few suggestions,
I think with 15+ characters that I've spent with expandstyle, aswell as some of my friends, considering it's a feature of the server and something we pay Cash Shop points for, I think it's just better to leave it on by default, and let whomever wants to turn it off, let it be off. As someone mentioned, its not used for recruiting members, and the option should definetely be disabled in PvP or any content maps where classes would be deemed important.
As a side note, I'm personally not the type of player to read much in introductions, I just wanna get in there, play my game and enjoy it. However, as an alternative, an automatic broadcast informing players they can turn it on can be an improvement.
Alternatively, let it be turned on by default in towns atleast, where that actually has very little impact on the experience for new players.