With signatures the maximum you will earn monthly will be around 0,15 btc with high paying signature, soo isnt a low ammount but is hard to be and remain there as well find a free spot, trading is the easy and better way to make such income monthly, eth, doge, and almost all top traded coins at poloniex had raised a lot last months, and all days some coin is being pumped, if you lucky you will had invest into it.
in fact the signature campaign income is not such a good one to me i think one can earn money from signature campaign s enough for his pocket money, but if a person want to make such a good profit, then to me i think trading is th best option. from trading one can really make good profit that we cannot imaging from signature campaign.
Sure, we can't earn too much from signature campaign, But i still like it and prefer for everyone, who want to earn bitcoin. Because i also started my career of working on bitcoin from signature campaign, and i get information and knowledge about bitcoin from it.
No doubt, it is also true, we earn from signature campaign it is not enough, it is just like our pocket money, and if we want to earn bitcoin professionally, than we should choose trading and investment.
Signature campaign will give you limited income in bitcoins and its good way to start off the journey in the bitcoin world and if you are a part of good campaign with a high rank account then you will be getting higher income in terms of bitcoins but to earn higher amount of bitcoins I think you should invest that earnings in trading where you can multiply your bitcoins in a quick time.