It is a worthy job. You need to check the project carefully before you're joining, bounty signature campaign often take longer than other campaigns. So if you get less than you think, you should use it for daily trading. It will make more profit for you.
I think the signature campaign is the least time consuming in all tasks. By joining a signature campaign, you can only perform 1 campaign at a time. And just make 10 posts in a week, it's easy and fast