I don't really care about signed message. Not sure I understand its importance.
All it proves is that an account was not hacked?
A lot of users won't know what signed messages are under Full Member rank I don't think.
A signed message proves that the account isn't hacked or stolen. You should always request it when doing loans... Otherwise you may end up with a useless hacked account, which you can't sell and the original owner can always get it back.