I know that there are other members here working day and night doing bounty campaigns. But i think that doing bounty campaigns is not worth it especially if you had a lot of work during the day. Some are just boasting on their bounty campaign earning wherein fact maybe because they are lucky to receive those awards but somehow do not wish that you could be like them because some of the ICO project that you will going to work will not give bounty rewards and some of it will fail, or just pause. So no reason for sleeping late at night.
You're right, a lot of people have extra work besides these bounty campaigns. And you really have to be lucky to choose a really good campaign to bring you good revenue then (if it brings you at all). So, I personally try not to spend more than an hour a day on bounty campaigns. So at least it will not be a big waste of time if things do not happen.