Additional suggestion:

It would be great information to include a player's level in any guild announcement or guild logging. For example:

<Name> (Level) joined the guild, invited by <Name>
<Name> (Level) left the guild
<Name> (Level) was promoted to <Rank>
<Name> (Level) was demoted to <Rank>
<Name> (Level) was removed from the guild by <Name> for <Reason>
<Name> (Level) was banned from the guild for <Ban Reason> for <Ban Type> by <Name>