OP, what kind of work do you do? And is your wife's name Bertha by chance?
That leather looks to be pretty F'd up. I'd take a guess that you work in the construction business and take your BMW to construction site everyday and get in and out of your car with dirty blue jean with your tool belt still on. I've had my F10 now for 16,000 miles and truth be told I haven't really cleaned the leather much and it still looks as good as the day I picked it up at the Welt in Munich with 1 mile on the car. I have dusted off my leather from time to time, but I haven't even used leather conditioner as 90% of the time I am the only one in the car and my M5 sits in the garage 90% of its life. As a pertinent and coincidental comparison, my neighbor actually happens to work in the construction business as a civil engineer. His car looks exactly the way yours does. Hmmmm....