I personally don't spend much time on bounty campaign due to the nature of my job, but I wish I could spend more time. Lately I spend less than 10 hours per week on bounties and major subscribe to signature and media campaigns which I believe is more lucrative than the social media campaigns.
It's all a matter of chance. Sometimes you spend an hour a day on one bounty, give yourself up, and in the end it's scammers, or they cut awards. Sometimes it happens that you do not spend a minute on the company, and you take and 2K$ pay.