I could count my modeling jobs on my hands and toes. When I graduated from college, I moved to New York specifically to study acting, and I needed to pay the bills, and it's better to make a couple thousand dollars in one day than to wait tables six days a week.
You are still lucky - you have a certain type of people who keep buying your music - but then you can get typecast and have to keep making that same music, and you can change only slightly. It's risky to bounce around and change your type of music.