I agree and I even want say more. You may sit for ages waiting untill someone buys for $450 today and waiting someone sells you at $441. All those calculations are good only in theory but in real life you have almost zero chances to make it happen.
So participating in a signature campain is a better option IMO.
Unfortunately signature campaign sometime can offend some people, even if the comment was within the topic and considerably contributing to the thread. So for everyone who will try signature campaign, please be prepared with such risk,
yes you may generate $1 within an hour but usually they are capped,
it is not $1/hour, it basically 1$/day