Power waste is an issue - at times where there is oversupply, wholesale power prices can actually go negative and at that point there is an excess of power in the network which cannot be stored and if it's not consumed will lead to electrical damage. So people actually get paid to waste power. Ever seen a sports stadium with all the lights blazing late at night even though noone is there? They are one of the groups who take advantage of negative power prices. There are also places where there are literally resistors placed along the ground to sink excess electricity (as heat) into the earth during these times.
When you say "eventually they will make it cheap" that seems likely to be a misconception also. Power production is not like manufacturing. Although innovation can lead to increases in efficiency and therefore reduced cost, inefficiency is not the limiting factor on power cost.