One of the biggest differences between HIV infection and the other disorders listed is that HIV is contagious. Look at countries who didn't spend that much on HIV early on. Swaziland has something like a 40-50% rate of HIV infection. Obviously, not all the money is spent efficiently, but Bush is working on that with some reforms on HIV spending here in the states.
But HIV is not contagious like measles or mumps. It is spread mainly by one way, and we have known how to stop that way for over twenty years.
The truth is that HIV positive gay men are not responsible when it comes to having sex, and that the gay world puts a premium on having sex with those already HIV/AIDS positive. The amount of anonymous gay sex increases the chances of infection exponentially. That is why we still see ridiculously high rates of infection, and that these rates cross over into heterosexual groups of both sexes.
It stems from irresponsible, unrestricted, and unprotected gay sex.
All of the money in the world and advertising can not overcome a lack of personal responsibility.