Signature campaigns aren't going to change life for the better or fight world poverty. It's just scraps compared to the time you're spending on doing it, that's for one, and the funds businesses spend on campaigns each month are just a drop of water in the sea. Think about it for a while and do some numbers. A typical campaign with 20 participants pays out maybe 1BTC per month. Even if that was given to some African village of 200 people, you wouldn't even be able to give each of them a dollar per day to buy food and medicine. You need millions to make a difference in there and they will probably destroy it anyway, because that's what is happening to many of the schools and hospitals that were built in Africa.