I think that the honest truth is that the alternatives are not economically viable period end of story, no conspiracy here move along.
Think about it, if you were an energy titan would you not have the resources to exploite the next source? Would there not be the incentive to be the company who saved the world from big oil? Could you not make an even larger return on investment if this source were cheaper? The truth is, prices are set by value to the consumer not by cost to produce. Why not get that "free" energy and sell it at a moderately reduced price? Drive the competition out of business and RULE THE WORLD!!!.
The reason is this... Oil is still the cheapest, easiest, and most dense energy source around. There was a time that wood, coal or peat were the cheapest easiest and densest available sources.