Well even if signature campaigns give us less earnings, it is still steady. And i agree that keeping a lot of bitcoins can't be considered as steady income because the price is fluctuating and we won't be getting enough here on a consistent basis.
Signature campaign is just one of the options. Second is you can do freelancing work where if you get good projects you will be loaded with work depending upon your skills. You can start trading btc or other altcoins which will provide another revenue generation source.