I think customers should consider energy usage. Older appliances could cost more in energy than they did to purchase.
I question whether government-sponsored programs like Energy Star and the EU energy label are a net benefit to customers. With Energy Star, it seemed clear that manufacturers use the blue stickers to promote more expensive (and often, less energy efficient) models. The EU system may well have the same issue, as well as being confusing with its major recalibrations.
The Energy Star approval of a gasoline-powered alarm clock does not improve my confidence.