I'm going to disagree with this as a general rule though it can be useful in some situations. Don't create two ranks of members, one of which is "people who have been around from the start" because the other, newer members a) can never achieve that rank and b) it creates a divide that's not based on anything they're doing. People who will cause drama over a rank in a video game guild probably need to be invited to leave, not coddled.

The reply to this GL was perfect btw... officers need to be officers because they're doing something to help run the guild. The only thing I'd add is that you probably don't need more than 3-6 officers - there just aren't that many tasks. I can think of (offhand):

1) Raid Leader (might need 2)
2) Recruiter
3) PVP Leader (if you do organized pvp like BGs)
4) Banker (in charge of organizing the bank, selling stuff that's not needed, etc)
5) Social coordinator (if you do events)

Give all of them invite powers. Make it clear that they need to DO these things - RLs need to post and run raids, etc. Make it clear that they can step down from duties when they feel burnt out or just want to and that they'll then be moved to member rank.