If you have a good post quality and descent rank then multiple campaigns will welcome you but there are many campaigns that allows jr member rank to join them so its a blessing for new comers who wants to start earning bitcoins and as they upgrade their ranks they can expect higher income in bitcoins.
Earning from campaigns is not at all a decent package and it is just an additional boost in your savings and nothing else.To say the least there are not much campaign that accepts people now a days and most of the campaign are here for a few weeks and some are really low paying ones and yes the payment are better than using faucet but it is not worth it at the moment.
i think signature campaign is not to totally support your financially, signature campaign can only give you a little income from which you can complete your daily needs. if you want to make money from bitcoin then you need to join or start trading from where you can make a decent amount of money which can change your whole life style. but trading need more hard work knowledge skill and experience and without that you even cannot expect income.