As we have said, membership to ClanAM does not mitigate you leave other LSes. We don't want to own you and keep you strictly for ourselves. We don't want you to leave your friends elsewhere or cut ties with other acquantances. In fact, if we cannot satisfy your end-game needs, then we encourage you to seek them elsewhere.
That being said, you will encounter other HNMLSes out there (usually run by children :-) who demand you drop any other LSes besides their own. While this is a practice we think is insanely stupid and would strongly suggest you don't allow yourself to be a slave to someone, it is ultimately your choice as to what you want to do.
Evaluate everything, both what the respective LSes can offer you as well as what you may have to pay for membership (e.g., your freedom) and decide for yourself.
We may be sad to see you go if you decide to leave us, but we will respect your decision.
You will have to give up your ClanAM End-Game pearl, but that's only because the other HNMLS will require it. ClanAM will not "punish" you in anyway, and will respect your decision.
That being said, the ClanAM members may be displeased with your decision. Don't be surprised if you show up and people razz you because of your decision.
The thing is, the way these other HNMLSes stay as exclusive as they are is by demanding a lot of your time. Thus, you will undoubtedly stop showing up for ClanAM proper events and become distanced from the friends you had here in ClanAM. So there's really little you can do about it if you make such a decision.
Bottom line is this: Put yourself in your friends shoes. If they were to ditch you the way you ditched them, would you be bothered because of it?
This is largely my doing. I'm a busy person. I work a full time job and run a non-profit educational software organization in my free-time. Thus, I simply don't have the time to divide up between many LSes.
Basically, ClanAM is my focus when gaming online, and ClanAM has multiple divisions, so I have to divide up my time carefully between them so as not to neglect any of them