"What's in it for me?" people ask, when it should be, "what's in it for aikido?"
At the very least... a donation to the founder's non-profit organisation for it's promotion.
So far as I can tell, the Founder had no interest at all in organizations of any kind.
If it's a donation - then call it a donation and give up the myth of rank, IMO.
Then there's the question of whether or not that donation supports the best way to promote Aikido, or the best thing for Aikido. I'm not saying it isn't, but the questions should be asked.