Computers and cell phones are On all day long on many cases
They are on but not on sites which are using hidden browser mining. You don't see that as unnecessary electricity cost? Not to mention all adds are eating CPU power and it spends electricity.To use faucets you don't need to use sites with hidden browser mining feature. I think you didn't understand... There are people who have their computers On all day long for another reasons, not to mine Bitcoins or to use faucets necessarily (at work is a common example or even at home).
People don't set it on just to claim on faucets. They use it for different activites and meanwhile, when there is some free time they claim some satoshis and accumulate it.
What can you possible earn if you claim from faucets while you are waiting for something?I'll rather wash dishes or take garbage out than claim from faucet, it is much more constructive than claiming 15 satoshi from faucet.
Lol, Some years ago there were people talking like you about faucets and now I'm sure many of them regret about not claiming 400-8000 satoshis from faucets on those days...
And if you use only real good faucets you won't waste your time at all... You will spend few seconds every hour with the chance to earn hundreds of Dollars in BTC or Doge (FreeBitco.in and FreeDoge.co.in faucets).
Don't be naive. How many times have you won 200$ from both sites? Or just one? How many users have won 200$?
I'll tell you how many times I did in last year and a half - 0 times.
What you could earn and what you are earning are different things.
Well, naive for me are those pessimistic that are unable to think on long term...
I think to click a "Roll" button without even solving a captcha every hour doesn't hurt anyone. Much better than physical lottery.
Asking today if faucet's income pay electricity bill makes faucets look really bad.
Can you cover your internet and electricity bill with faucets? You know, they are cheapest bills in most countries. Can you cover at least one? If you can't cover at least one bill every month it is waste of time, if you need to spend 8 hours every day to cover only one bill it is waste of time.
I'm thinking on long term, not in paying bills on the present time with BTCs (what would be a waste of money).
but to buy even more expensive items (who knows a house?). 
Only if you are one of the early bitcoin supporters when faucets were paying lots of bitcoins(not dollars) and you didn't spend any of them. This is probably a joke, do you realize how much bitcoin has to worth for someone to buy a house just from faucets?
Compared to the next decade we are early adopters too... In 10 years people will regret a lot about not using faucets like some people regret now about not using it on the first years of Bitcoin.