There are 400,000 of us on dialysis. Not a huge amount compaired to people with cancer or other diseases.
However, approximately one in 10 American adults (or 20 million) have some degree of chronic kidney disease according to the CDC.
So, no we are not a priority. Plus we have dialysis to keep us alive (sort of ) so they go for the ones in immediate danger.
Okay, let's take your example of cancer instead. The 2012 actual budget for (all types) cancer research for the NIH was $5.6 billion with approximately 577,000 people killed by the disease (that doesn't even count the people living with the disease).
Giving the (probably extremely generous) premise that the NSA has saved 10,000 lives from 2001-2012, that would average out to around $12 million per potential death compared to about $9700 per
actual deaths (again, add in people living with the disease, and that number gets much smaller). I know it's a little bit apples to oranges comparison (12 years compared to 1 year), but I still think the point is clear.
I know where the real terror lies in our country.
(P.S.: I know you weren't really disagreeing with my point, just sort of sarcastically playing devil's advocate, but I thought I would use your post to expand upon mine.)