Well, you don't even have to be cynical (although, having worked years on contract at Eli Lilly, I'm pretty cynical). All you have to do is look at the way the FDA is structured to see that you have to generate a lot of money for any new drug or technique just to be able to pay for its approval. The only way you can do that reliably is by always shooting for the maintenance dose of $300 a month from every patient. A one-time shot just isn't going to pass the math test.

As is always the refrain, the system is broken - if what you want is cures instead of a large and lucrative pharmaceutical industry.