Imagine you had a daily income of 40$ each day in bitcoin, what would do with them and where would you invest them ?
I think that with the $40 daily you should invest in the project safe low profits of about 1% per day. E.g.
https://ethtrade.org/agent485529Honestly there is no guarantee or assurance that you can make $40 usd daily more or less it will be still depends if you are skilled you can high amount of $40 if not and you are selling something if you know how to promote and more impressions about your product you can earn above $40.
There is no stable earnings.. it will be still depends on us how we are driving our money to increase the amount.. if you are lazy and you can't work hard you can only earn small amount but if you are lazy but you have huge capital or money you can hire people to work for you and earn. multiple business can make your more earnings.