You guys forget that the biggest drug dealers in the world are pharmaceutical companies. There is not money in the cure. The money is in drugs that let you "cope/live with it".
Think about it for a minute... if there was a cure for aids how much would it cost? 1 million 2 million?
As kirks5oh said 10K a year on drugs to just make your life last a few more years. 10K * 10 years is 1.2 million. What if they came up with drugs that would let you live for 50 years without dying from aids. 6 million dollars per person. Times the number of infected people = more money then just curing everyone.
This isn't a conspiracy theory this is just plain math.