:-)
I don't think it follows though. If they are marginally economic that probably means the energy savings are marginal too.
Look at how CFL bulbs have taken off. Not because they represent huge savings in energy, but because they last longer as well.
Everyone knows that the two dominant domestic uses of energy are cars and central heating. The rest is trivial. Just a 10% improvement in house insualation here, would pay for three years of hot water in a year.
Cutting out one supermarket trip a month would save more than equipping all the rooms with CFLs..
Wer have a wonderful solar heating system here. Its called windows. In the winter daytime, we draw the curtains, and get what sun there is heating the house. At night, we draw the curtains, and it stays in.
We have another form of solar heating too. Its called a log burning fire. In summer the sunlight is converted into wood., In winter we burn it.