Yup earnings from signature campaign is an good source of extra money which can take care of your basic expenses but always keep on thing in mind that something is always better then nothing.
Earnings in signature campaign isnt big enough to support your daily needs but as we all know its better than nothing. Joining signature campaign doesnt only give money it also give you ideas and youll able to learn the things about bitcoin that you dont know in the past.
The main purpose behind joining a signature campaign should not be earning bitcoins as it doesnt pay you that much btc that can fulfill your needs of everyday but the experience and the knowledge it provides you are priceless.