Time-consuming
If you thought that being a biker gang member was just a part-time job that you could do while you had another career, you are dead wrong. Becoming a member is hard enough and once you are there you are expected to be nowhere else but present. Kiss any other career or life you had planned goodbye.
Being a biker is a full-time thing that takes up absolutely all of your time. They are constantly planning something or traveling around on their motorcycles. Just how are you going to have any type of hobby outside of the gang if you need to be around them for most of your day?