That's actually a bit misleading. Chemotherapy has a success rate of 40% in some cancers, and is completely ineffective in others, giving an average of 2% overall, but chemo isn't recommended where it doesn't do anything. The study on dichloroacetic acid that showed the 80% effectiveness was only done on one type of cancer, and the overall average is unknown.
And besides, sodium dichloroacetate (the compound actually used in treatment; dichloroacetic acid itself is volatile, horribly corrosive and toxic) is cheap, can be bought from pharmacies, some clinics already use it to treat cancer, and if you approach your doctor with the resources you posted up there, (s)he should have no problem in (highly unofficially) suggesting it as a treatment. It can't be prescribed or officially recommended for fear of horrible, horrible lawsuits (yet another problem with healthcare these days).
And the real question isn't why pharmaceutical companies aren't investing in clinical trials for a drug they can't make any money off (why
would they?), it's why isn't anyone else paying for them. I'm looking at you, Bill Gates.
On to merrier topics: the economy!