Addiction is all about seeking external relief from mental pain; whether you use cocaine, online poker, shopping, sex, razors, cake or exercise. Addictions are all the same ultimately. You seek to treat an internal pain with an external substance or activity. You pursue a once-pleasurable activity to the point of self-sabotage. Alcoholics often lose their jobs, houses, relationships, friends, everything; how can anyone call that self-indulgent?