BTW, wealthy retirees don't want additional income at all! And they certainly don't need it monthly vs quarterly. I plan to die with all of my appreciated investments... good tax planning.
I own a Closed End Fund that just went to a 6% minimum annual payout. How do the do that? Well, if the fund doesn't make 6% (and it won't in a bear markets) they just pay it out of principal. That is, I get paid MY money!
AGNC is just one of a bazillion gimmicky income investments... that most people should avoid.
You could also argue the leverage it uses is another gimmick. Although it's not one of the most leveraged.