no one is going to give you free bitcoin.if you think earn more or without hard work? then dice,gambling is best way to make your bitcoin double. but this might make you pauper because it have 50% Chance to win and 50% chance to loss.so that i think signature campaign is best way.and next lets see what people say in it.
I think you are right, signature campaigns are the best and safest way to grow your bitcoins, yeah it is time consuming but again the returns are guaranteed, on the other hand gambling doesn't assure you that you would win every time. Totally depends on luck.