Why? Money!
Now that there was a shortage some reloaders are willing to pay $40 or more for 1000 primers. Personally I was upset paying close to $30/K but because we panic every time the shelves get lean they can push the prices up 30% or more every time they pull this trick on us. I have not bought anything overprices since this started!! That includes 22LR ammo which is the worst price gouging of everything I've seen. ($60+ for a brick of 500 rounds! NOT ME)
At gun shows in Jan-April, I saw SPP and LPP as high as $80/1000 and in very short supply. By April, prices were back down to $40-$50/1000, and in much higher supply levels. I think it should be back around $20/1000 in a month or 2.
Oh, and people are selling bricks of 22 for $80-$100 here