My SWAG (Scientific Wild Arsed Guess): If reloaders would not but components at these prices, the scalpers would soon drastically lower their asking prices....
As far as rising prices, it started way before the last year. Up here, inflated asking/selling prices of firearms/components/ammunition started when it became apparent that Obama would be the Democratic nominee in '08. At that time, I still attended the local gun show and after Obama's nomination, I recall primer prices increasing about $20.00 per K, with powder, bullets, and loaded ammunition not far behind. This trend continued well on into his first term with all the talk about re-enacting the Assault Weapons Bill and all the media/blog/internet rumors of more stringent firearms control. And I heard the same thing from Fellow Shooters in other states.
Then the "icing on the cake" was the December 2012 school shooting and all heck broke loose with buyers. The day after the school shooting, a local gun shop had people waiting in line to buy ammunition/reloading components, etc., well before the 9:00 AM opening time. Within a week dealers like Midway, Cabela's, Graf, etc., were reporting that certain items were out of stock. And the situation became worse as far as availability. It seems to be letting up some, but shortages and increased prices are still something to contend with.