Looking at the realistic predictions of BTC difficulty increases I can see that BTC ASIC mining will be a huge gamble for ROI for all entry miners at this point in time at this stage. The ASIC companies cannot keep up or it is not in their interests to do so (to sell upgrades).
Energy price does play a role but if you are going to mine regardless then it should not be a major concern for you if you are already a consumer that uses more energy than average, IMHO. Then you only have to be mining for speculation of rising BTC to $1,000 - $10,000 long term. 2 - 5 years. Of course a lot could happen by this time and another currency may have taken its place (unreal to think of now). The fact remains there are better coins than BTC that are more secure, have protection of 51% vulnerability and faster transaction time. But this also depends on how fast people are on the uptake of this knowledge and BTC may well win because we know the best does not always win but the most popular and liquid one will be used and as a result hold more value with more demand. Having said this the alt coins will follow eventually but they will lag behind. Just a prediction in my opinion and I could well be wrong. Many things can happen that do and have affect prices, just as they do with Forex and Stock markets with geopolitics, only with Crypt currencies the fundamentals vary slightly in the way they influence the market.
http://mining.thegenesisblock.com/a/e9004f2169http://mining.thegenesisblock.com/a/c1b816e7f5If you got your machine earlier than New Year - 2014 you will be better off otherwise you will likely make a loss mining - so can keep mining for speculative purposes until difficulty increases make this undesirable. IMO, the get rich quick days for early adopters of BTC mining is over unless a tech company can far more out perform current ASIC technologies - lower costs. Of course it is meant to be this way inherently so no single central entity can amass a majority share. Perhaps trading is better to earn a ROI from, I think you will find it is.
Good luck everyone! Even the most ethical (I use the term loosely for want of a better name = opportunists?) ASIC companies that allow escrow payments and have insurance against difficulty increases will not likely net you a profit.