If $1 Is a big amount in your country then i wonder how the earnings of signature campaign means to you because you would probably earn more than $15 a week with it which should be a reasonable amount for you as you mentioned.
Well in my country $1 is nothing at all, we even mostly spend more than that in a day with just friends stopping at a shop for eating ice creams or drinking juice or something.
In signature campaign you don't need to spend that much time like 8 hours or so, i'm a student and i don't have that much time to work contineously for 8 hours to earn $8 and if i work 8 hours a day for just 8$ a day then i really think that does not worth it.
But since you have said that you are student, if you are going to think wiser having small amount rather than to have nothing is much better right?
So for me, if that is going to happen to me that I am going to work for 8 hours and going to receive $8 then that is fine for me and I am able to survive that for a day because I'm still single.