"if you can afford to buy this type of cards then you should be able to pay for your electrical bill, if not then don't bother."
The electrical bill is only one reason for being curious about power consumption. Other reasons, and possibly more relevant ones, would be heat and noise output.
Can my PSU handle this midrange card or do I have to step down a bit more or get a new PSU? Is my case airflow good enough, will other components be affected by potentially higher case temperatures? Will it limit my overclocking potential? Will high temperatures shorten the lifespan of the card? Is the fan noise bearable, either under idle or load?
There's lot of things that can be implied, or derived, from a cards power requirements. Naturally it's best to wait for the reviews but your assumption that people only care because of their electrical bill is fallacious at best.