Money
I ride HD's because it makes financial sense to. My truck gets 16 MPG. MY HD gets 35 or so. With all the money I save on travel expense, I should be able to retire 5 years sooner.
Thing Green
I make less of an impact on global warming riding a motorcycle.
Safety
I feel much safer on a motorcycle than in my truck. In my truck, I get a false sense of security. Seat belts, windshields, enclosed cab etc. In reality that 28 gauge galvanized sheet metal doesn't protect much. On the bike, I know I'm more exposed, so I'm safer.
Tires
In my truck a set of tires last about 40,000 miles, but there's 4 of them. When I wear out tires on the bike, there's only 2.
The little woman
I also ride motorcycle because my wife pressured me into it. If momma is happy, I'm happy.
Posing
I'm actually a delicate wall flower. I'm more of a GQ type of man. Riding a HD makes me feel like a bad a$$ biker. I know bullies won't pick on me if I'm a biker.