"Every bottle is its own learning experience." -- Sensei Ox-sama
Yea, I'd agree with the Pliny reference. I think it will eventually become more available when the novelty wears off. I'm sure there are tons of people sitting on unopened bottles of the stuff, that will eventually get bored and move on. That being said I'm sure the S-W stuff will always command some premium.
I've only ever had the 15, and I must say it is a very good bourbon. But I don't know that it demands the price some are asking and evidently paying.