Why are all the 280x's $400

Last week I was so happy that I only needed $20 more dollars to get a 280x because they were only $320.. I just went onto Newegg and EVERY 280x is $400! What's up with this?!

They are in high demand because of the recent Litecoin craze.

Blame all the miners! 

I might start looking at the 770s, I really like Shadowplay.

Blame me. I'm a miner. Supply and demand. Sorry about that.