I had a hematologist who told me he had never had a patient go into remission using IVIg.
Personally I wouldn't want to do IVIg all the time - it's a blood product and my ITP began very shortly after receiving a gamma globulin injection. It is believed it was the injection that triggered my ITP. Now if IVIg was the only thing that kept my platelets at a livable number then that would be a different story. There was a delightful older woman here some years back and IVIg, a certain brand, was the only treatment that worked for her, never cured her though.
"Instead of wasting your time worrying about symptoms, just get it checked out" -Nieca Goldberg, MD