Hashflare is apparently almost out of available hashrate. The price recently went up 47%.

On December 8th, Bitmain was selling the Antminer S9 for $1,415.
Bitmain is now selling it for $2,725 and shipping it in February. That's a 93% increase and they won't ship it for two months.

I've seen this before...people get crazy over Bitcoin mining for a while, then reality sets in. They see radical price and difficulty increases, then finally quit.

mghaynes - you should be using 100% Antpool for maximum profit
https://hashcoin.co/pool