It's not just multiple myeloma. All sorts of cancers are getting exciting and effective treatments. Some are still really bad news, though.
The US health system is criticized for being expensive, but some of that is from the US effectively bankrolling the development of these new treatments, which the rest of the world gets after some delay.
It would be nice if doctors did anyway, but I can certainly understand why they wouldn't.
Edit: Bacillus Calmette-Guérin (BCG)