I think this is not true. It depends on the end result of the campaign. If the campaign is successful, and all the members receive the reward, we do not waste our time. By contrast, the campaign is a scam, and you have wasted too much time. So you should find out when you join the signature campaign.
When you take different Bounties (I mean the tasks), you earn the money that you can later invest in the crypto and get more profits. The Bounty campaigns give all people the possibility to earn.