What's profitable is decided by what people want, and we are no one to impose our priorities onto the world.
Cancer isn't getting cured because it is not spreading virally. The day the threat level is same as Polio, Small Pox or such disease, the solution will be inevitable.
ie. Curing cancer vs Curing Baldness vs Populating Mars
Surely they are not equal, but curing baldness may very well be the most profitable in this world.