That is exactly what I was concerned about. According to
http://www.vnbitcoin.org/bitcoincalculator.php , the difficulty february 1st will be 2,379,795,897.
According to
http://www.alloscomp.com/bitcoin/calculator , the daily mining reward will be 0.42264676 BTC and at the current exchange rate, that would be $476.09 a day, only needing 12 days to break even. However, who knows what the difficulty level will actually be in February and who knows what the exchange rate will be. This is why I'm concerned with investing into mining.