I used to be miner at deepbit around 6 month ago, my speed is over 400 MH/s. I earn 0.01BTC around 1~2 day easily.
Then I start mining this week, but I noticed my BTC seems not increased any bit? It seems stopped at 0.00078662 BTC. Why? Is it so hard to get BTC these few months?
Please refer to the difficulty history at the bottom of the page.
http://bitcoinwisdom.com/bitcoin/difficulty Date Difficulty Hash Rate
Nov 17 2013 609,482,680 4,362,847 GH/s
May 25 2013
12,153,412 86,998 GH/s
I know it sounds crazy, but your current mining revenue (in terms of BTC) should be less than 1/50 (2%) compared with 6 month ago.