It is high but justr read that C's free cash flow is like $24 billion a year and the dividend is like $10 billion a year. So although pricey coupon, they can still affor to pay it and when they turn it around or it gets too high I am sure they will convert the stock so they will be forced to pay a lower dividend than higher status preferred dividend. Then they can cut the dividiend if they are in serious trouble. Either way, despite the cost they can absorb it as of now.
Listen to this info on Citi.
The Whitney audio/video link.....
....90% of their earnings this year will have to go to pay the dividend......NOT GOOD. http://www.bloomberg.com/index.html?Intro=intro3